To ensure the safe and normal operation of the electric hoist gantry crane and to extend the lifespan of its components, parts, and the crane itself, regular inspection and maintenance are essential. This article provides a detailed explanation of how often each part of the crane should be inspected and maintained, and the specific steps involved in these processes. We hope this guide proves helpful to you.

Daily Inspection

Daily Pre-Operation Inspection

• The inspection shall be performed by the operator; repairs shall be handled by designated maintenance personnel.
• Check whether there are any obstacles within the working area and whether the transportation route is clear; operation is not allowed until any issues are resolved.
• Check if there is any oil, water, or debris on the rails. For outdoor cranes, check for mud, ice, or snow. Remove all contaminants or obstacles before starting operation.
• Check whether the crane can move freely in all directions without load. If not, repair immediately.
• Check whether the braking system and other safety devices operate sensitively and reliably. If any issues are found, repair immediately.
• Check whether the lifting and hoisting control systems are functioning properly. If not, repair immediately.

Daily Inspection During Operation

During operation, the operator should constantly observe for any of the following abnormal conditions. If detected, stop operation immediately and notify maintenance personnel. Resume operation only after the issue is resolved.

• Abnormal vibrations, impacts, swaying, or shaking during operation.
• Unusual noises or excessively loud sounds.
• Severe hook slippage.
• Severe trolley or crane slippage.
• Severe skewing or rail biting.
• Any other abnormal conditions.

Daily Inspection After Operation

After finishing the work, the operator must perform routine safety inspections and inform the next shift operator verbally or in writing of any problems. If repairs are needed, the next shift operator should inform maintenance personnel. Resume operation only after repairs are completed.

• Check for loose fasteners at connection points.
• Check for overheating in motors, electrical systems, and reducers.
• Check for oil leaks at gearboxes or areas with oil seals.
• Check wear on exposed parts such as wire ropes and wheels.
• Check for electrical hazards such as live wires or leakage.
• Inspect crane body for corrosion.
• For outdoor cranes, check for water, snow, or ice accumulation on the crane body.

Daily Maintenance Tasks

Maintenance Tasks to Be Performed by the Operator

• Regularly clean the operator’s cabin windows.
• Regularly clean the cabin, walkways, ladders, and other areas.
• Regularly remove dust and debris from motors, electrical components, gearboxes, and bearing housings.
• Regularly clean the rails of debris, snow, and ice.

Issues the Operator Should Report to Maintenance Personnel

• Apply lubrication and clean exposed friction surfaces in motion.
• Repaint areas with missing or peeling paint.
• Install rain covers where necessary.
• Check for aging or cracking of electrical cables and wires to prevent electric shocks or short circuits.

Monthly Inspection

Overall Equipment Performance

Элемент	Frequency	Content and Requirements
Machine noise test	Once every 3 months	Use a sound level meter (decibel meter) to measure noise during lifting, lowering, and traveling. The sound level meter acts like a stethoscope to detect and analyze abnormal conditions through noise levels.
Inspection with full load	Once every 3 months	Visually inspect for abnormal vibration of the main beam or load during full-load lifting; listen for unusual sounds from mechanisms; when possible, touch gearboxes and motors to detect overheating. Analyze and eliminate any abnormalities.
Check when full down with full load	Once every 3 months	During full-load lowering, stop the hoist and observe the amount of slip. If excessive, adjust the brake gap of the hoisting mechanism until proper braking is restored.
Hoist trolley traveling check	Once a week	Observe whether the trolley struggles when climbing, slips, has suspended wheels, rail biting, or flange climbing. If such issues occur, check the main beam stiffness, rail surface cleanliness, and trolley assembly precision.
Crane brake check	Once a week	Check if there is noticeable asynchrony during running and braking. If so, adjust the gap of the main trolley brake. Preferably, the same person should adjust both brakes to ensure consistent hand feel.
Crane running condition check	Once a week	During operation, check for abnormal snake-like movement, twisting, lateral slipping, skewing, rail biting, or unusual noises. Record findings and investigate the cause.
Check the brake in the crane operation	Once every 3 months	Check whether the traveling brake is sensitive and whether it fails to stop the crane or has excessive sliding distance.
Wheel load balance (three-Leg phenomenon) check	Once every 3 months	Observe whether any of the crane’s four wheels are suspended, or if any wheel shows partial rotation or no rotation during operation, indicating a “three-leg” phenomenon.
Leakage check	Once every 3 months	Check for oil seepage or leakage in the hoisting reducer and trolley/traveling reducers.
Surface appearance & quality check	Once every 6 months	Inspect for rust, paint peeling, or physical damage on any part of the crane surface.

Crane Rail Inspection

Элемент	Frequency	Content and requirements
Running range inspection	Once a week	Check for any obstacles within the travelling range. Ensure the gap between the crane and the top and sides of the construction building is not too small. Also, check for any dangers that may cause collisions with lamps, tubes in the building, or proximity to bare copper conductors.
End stopper inspection	Once for three months	Check if the end stoppers are deformed, damaged, or at risk of detachment. If fixed by bolts, check for looseness; if welded, inspect weld seams for cracks.
Rail deformation inspection	Once for half a year	Inspect the rail from both vertical and horizontal directions for abnormal bending or deformation beyond installation tolerance limits.
Rail installation inspection	Once for half a year	Check for deformation at rail joints, loosened fixing bolts, lateral rail displacement, and weld cracks. Also check for looseness in shim plates and connecting plates.
Rail wear inspection	Once for half a year	Inspect the rail tread and side surfaces for excessive local wear. For I-beam rails, check the flange tread and ends for peeling, wear, or deformation.

Main Beam and End Beam Inspection

Элемент	Frequency	Content and requirements
Main and end beam weld inspection	Once for half a year	Check whether there are cracks in the welds on the main beam and end beams.
Main beam wear and deformation inspection	Once for half a year	Check the I-beam flange tread and side areas of the main beam for severe wear or plastic deformation (flange sagging).
Main and end beam connection inspection	Once for half a year	If the main and end beams are bolted together, check whether the bolts are loose.
Rail on main beam inspection	Once for half a year	For supported-type rails installed on the main beam, check for abnormal bending or deformation. Check if rail clamps and bolts are loose, and inspect welds for cracks.
Trolley end stop inspection on main beam	Once for three months	Check whether the trolley end stops on the main beam are deformed, damaged, or at risk of falling off. Check if bolts are loose and welds are cracked.
Buffer inspection on main and end beams	Once for half a year	Impact buffers installed on the main beam end stops and end beam ends must be securely fastened. Check for loosened bolts and any cracks, fractures, or damage on the buffers.

Motor Inspection

Элемент	Frequency	Content and requirements
Motor overheating inspection	Once for three months	Check whether the hoisting and traveling motors are overheating. If so, analyze whether the cause is excessive overload, voltage fluctuation, frequent start-stop operations, too small brake clearance, or abnormal friction between the brake wheel and the brake ring.
Motor abnormality inspection	Once for three months	Check whether the hoisting and traveling motors are difficult to start, excessively noisy, or producing abnormal sounds. Analyze whether the causes include excessive overload, low power supply voltage, incomplete brake release, or poor/loose wiring connections.

Brake Inspection

Элемент	Frequency	Content and requirements
Wear condition inspection	Once for half a year	For conical brake motors, open the motor cover to observe the wear condition of the conical brake ring or flat brake ring. Manually push the fan wheel axially to check end play; excessive end play indicates severe wear. The end play must not exceed 4 mm and should be adjusted to 1.5 mm. Otherwise, the brake ring must be scrapped and replaced. For flat or shoe-type brake materials, replace them when the wear reaches 50% of the original thickness.
Brake performance inspection	Once for half a year	Check whether the brake in the hoisting mechanism can effectively stop the load during lowering. If there is excessive slippage, adjust the brake performance promptly.
Abnormality inspection	Once for half a year	Check whether the locking nuts of each brake (for conical brakes) are loose. Inspect the wear of joints in the linkage mechanism of electromagnetic shoe brakes and check if the spring is loose. If there is a screeching noise during braking, inspect for relative friction or poor contact between the brake wheel and the brake ring (pad or block), and check if the spring is plastically deformed.

Reducer Inspection

Элемент	Frequency	Content and requirements
Gear transmission noise inspection	Once for half a year	Check whether the transmission gears in each mechanism produce abnormal noise. Determine if the abnormal sound is caused by insufficient lubrication, severe gear or bearing wear, gear surface damage, or poor gear machining and assembly accuracy.
Abnormality inspection	Once for half a year	Check whether the connecting or fixing bolts of each reducer are loose and whether there is any oil leakage. For the hoisting reducer, inspect if the housing has been cracked due to hook swing impact, possibly caused by failure of the hoisting limiter.

Drum Inspection

Элемент	Frequency	Content and requirements
Wear condition inspection	Once for half a year	Check the wear condition of the rope grooves on the drum. Look for any abnormal wear.
Drum shell inspection	Once for half a year	Check whether the drum shell has any dents or damage, especially those caused by the hook pulley striking the shell when the hoisting limiter fails.
Rope guide inspection	Once for half a year	Check whether the rope guide is cracked, and ensure the wire rope can pass smoothly through the rope guide outlet during empty hook lowering.
Abnormality inspection	Once for half a year	Check whether the rope pressing plate on the drum is loose, whether the drum connection bolts or rope guide mounting bolts are loose, and whether the guide slider inside the rope guide moves smoothly.

Steel Wire Rope Inspection

Элемент	Frequency	Content and requirements
Broken wire inspection	Once a week	Observe whether there are broken wires on the rope. If the number of broken wires within one lay length exceeds 10% of the total wires, the rope must be scrapped.
Wear condition inspection	Once a week	The reduction in rope diameter due to wear must not exceed 7% of the nominal diameter. Otherwise, the rope must be scrapped.
Deformation inspection	Once a week	Ropes that are crushed or twisted due to oblique lifting must be scrapped.
Corrosion inspection	Once a week	The surface of the wire rope must be free of corrosion and should retain a proper amount of lubricant, without excessive dirt.
Twist in the air fault inspection	Once for three months	Observe whether the wire rope is twisted due to failure to loosen the rope when binding, which may cause internal stress or misalignment.
Abnormality inspection	Once a week	Frequently inspect critical working and safety-related areas of the wire rope. Ensure that all rope fixing points are secure. Check for sufficient lubrication and that there is no rope biting at the contact points with pulleys or sheaves.

Hook and Pulleys Inspection

Элемент	Frequency	Content and requirements
Crack inspection	Once a week	There should be no harmful cracks on the hook, block, or block shell.
Wear condition inspection	Once a week	There must be no abnormal wear on the hook opening or pulley grooves.
Abnormality inspection	Once a week	Check for pulley damage, unsecured hook nut, loose bolts on the shell, baffle plate, or baffle shaft plate, and loose bolts on the balance pulley.
Deformation inspection	Once a week	The hook opening must not show any abnormal deformation.
Rotation inspection	Once for half a year	Check whether the hook and pulleys can rotate freely and smoothly.

Crane Wheels Inspection

Элемент	Frequency	Content and requirements
Wear inspection	Once for half a year	The tread and the inner surface of the wheel flange must not show any abnormal wear.
Crack inspection	Once for half a year	The wheel surface must be free from abnormal cracks and damage.

Drive Shaft and Couplings Inspection

Элемент	Frequency	Content and requirements
Deformation inspection	Once for half a year	Check if the drive shaft has deformation, vibration, or other abnormal phenomena.
Support inspection	Once for half a year	Check whether the drive shaft support bolts are loose and the oil supply condition.
Coupling operation inspection	Once for half a year	Check the wear status, fastening condition, and operational state of the coupling for abnormalities.

Operator Cabin Inspection

Элемент	Frequency	Content and requirements
Fixed condition inspection	Once for half a year	Check if the cab’s fixing bolts are loose; if welded, check for cracks in weld seams.
Working condition inspection	Once for half a year	Verify ventilation, heating, lighting are normal and reasonable; check if the cab shakes excessively.

Nameplate Inspection

Элемент	Frequency	Content and requirements
Check visibility	Once for half a year	Check whether the location of tonnage plate is reasonable and obvious.
Check fixed condition	Once for half a year	Check whether bolts or rivets of tonnage plate and nameplate are loose.

Power Supply Introduction Device Inspection

Элемент	Frequency	Content and requirements
Bare slide-wire safety inspection	Once for three months	Check whether the safety distance between crane bare slide wire and surrounding equipment meets regulations and whether appropriate safety protection measures are in place.
Surface of slide-wire inspection	Once for three months	Inspect the sliding contact surface of the slide wire for corrosion or rust defects; use wire brush or sandpaper to clean timely to ensure conductivity.
Insulation device	Once for three months	No damage allowed on supporting insulators of slide wire; connection parts should not be loose.
Cable introducing device inspection	Once for three months	Check wear and tightness of strained steel wire rope supporting the cable when cable introducing device is used.
Slide wire safety mark inspection	Once for half a year	Check whether there is a safety mark on the non-conductor side connection surface of slide-wire and whether there is an indicator light showing power status.

Current Collector Inspection

Элемент	Frequency	Content and requirements
Inspection of wear condition	Once for half a year	Check wear condition of current collector pulley, pin shaft, or suspension ring; no abnormal wear allowed.
Fixed condition inspection	Once for half a year	Connection bolts between current collector and cable must not be loose; insulators and fixing must be safe and reliable.
Block turning state inspection of current collector	Once for three months	Current collector pulley should rotate flexibly and smoothly; if there is friction noise or difficulty in rotation, lubricate promptly.
Spring of current collector inspection	Once for half a year	Springs of current collector should maintain good elasticity without rust or fatigue.

Wiring Inspection

Элемент	Frequency	Content and requirements
Wiring surface inspection	Once for three months	Wiring from current collector to motor and electrical devices (internal wiring), including rubber soft cables, must have no external damage.
Fixed connection inspection	Once for half a year	All electrical fixing bolts and internal wiring fixing bolts must not be loose; wiring conduits must be firmly fixed to the machine body.
Flat cable extension performance inspection	Once for half a year	Check whether flat cable has difficulty extending or retracting due to material or aging; flexibility must not deteriorate.
Cable remove inspection	Once for three months	Check whether the soft cable used as power input has abnormal bending or twisting during movement.

Electromagnetic Contactor Inspection

Элемент	Frequency	Content and requirements
Contact and core inspection	Once for three months	Open electromagnetic switch box; check contacts and core for abnormal wear or damage; core end face should be flat and clean.
Wiring fixed state inspection	Once for half a year	Check whether each wiring fixing bolt is loose.
Contactor operation inspection	Once a week	Operation should be sensitive and reliable; contacts must be tight without sticking or jamming faults.

Pendant Inspection

Элемент	Frequency	Content and Requirements
Appearance Inspection	Once a week	Button mark should be obvious and there should be no damage to the pendant switch.
Troubles Abnormity Inspection	Once a week	Connection part between pendant control and end of cable should not have damage and there should not have trouble like broken wire.

Lifting Limit Switch Inspection

Элемент	Frequency	Content and Requirements
Action inspection	Once a week	Check whether the hoist limit switch action is sensitive, safe, and reliable.
Contact point inspection	Once for three months	Check whether the switch contacts are damaged or broken; replace promptly if severely damaged or worn for safety.
Wiring fixed state inspection	Once for half a year	Check whether the wiring fixed joint bolts have loosened.
Spacing position inspection	Once a week	When the hook pulley block is hoisted to the upper limit position, the hoist limit switch should act immediately; the distance between the highest point of the hook pulley block and the lowest point of the drum should be at least 150mm.

Annual Inspection

Crane Runway Rail Inspection

Элемент	Стандарт
Rail tread cleanliness	No attached greasy dirt or amount of dirt.
Rail span inspection	Bearing type rail: S ≤ 10m, ΔS = ±3mm S > 10m, ΔS = ±[3 + 0.25 × (S-10)] mm Suspension type rail: ΔS = ±5mm Примечание: S = span (m), ΔS = tolerance of span.
Inclination of rail tread	≤ I/1000.
Elevation difference of two rails in same section	≤ s/1000.
Elevation difference of same side rail bearing	≤ L/1000.
Rail joint distance	Joint distance ≤ 2mm.
Crack and deformation inspection	Cracks and plastic deformation are not allowed.
Rail juncture displacement	Vertical and lateral offset ≤ 1mm.
Rail tread fatigue inspection	No spalling or fatigue damage on rail tread.
Wear and tear of rail	Support type rail: wear ≤ 10% of original size Suspension type rail: tread wear ≤ 10%, width wear ≤ 5%.
Fixed installation inspection	Joint bolts must be tight; welding lines must have no cracks or defects.

Crane Frame Inspection

Main Beam Inspection

Элемент	Стандарт
Appearance quality of main beam inspection	Damage or unusual deformation is not allowed, the corrosion proportions should be not more than 10% of original dimension, coat of paint should not flake.
Welding line quality inspection	Defects like crackles in welding line are forbidden.
Camber inspection at midspan of main girder	Camber △F=(1/1000~1.4/1000)s.
Bending of main beam inspection	Bending △Fp≤s/2000.
Worn condition inspection of electric hoist traveling rail	For main girder I-beam type rails, tread wear should not exceed 10% of the original size; width wear should not exceed 5% of the original size.
Deformation of I-beam flange	Flange of I-beam should not have obvious plastic deformation.
Running rail fixed installation inspection	The rails are connected by bolts, which should not be loose, fixed rail through welding, welding seam should not have crackles.

End Beam Inspection

Элемент	Стандарт
Appearance quality of end beam inspection	Damage or unusual deformation is not allowed, the corrosion proportions should be not more than 10% of original dimension, coat of paint should not flake.
The deviation degree of wheel distance	K≤3m, △K=±3mm K>3m, △K=±K/1000mm (K: base distance, △K: deflection of base distance).

Traveling Mechanism Inspection

Элемент	Стандарт
Traveling motor inspection	The motor should not have difficult starting, excessive noise, abnormal sounds, or overheating.
Traveling brake inspection	Brake should be safe, reliable and flexible. When the following conditions occur in the brake parts, they should be scrapped: Wear of crackles, brake ring or brake block reach 50% of original thickness. Spring deformation. Wear of small shaft or diameter of axle hole reach 5% of original diameter. Brake friction surface of brake wheel should not have faults or oil stains. When wear of brake wheel flange thickness reaches 50% of original thickness, and flange roughness reach 1.5 mm, they should be scrapped.
Installation of traveling reducer	Fixed connection bolts must not be loose.
Appearance of traveling reducer	The shell must not be traumatized or damaged.
Gear quality inspection	The gear should be scrapped under any of the following conditions: Cracks on the gear. Broken teeth. Pitting damage on the tooth surface reaches 50% of the meshing surface or the depth reaches 15% of the original tooth thickness. Other meshing tooth thickness wear reaches 25% of the original tooth thickness, or 30% for open gears.
Traveling reducer sealing inspection	No leakage.
Key connection inspection	The key cannot be loose or deformed.
Worn condition of shaft	Diameter difference of wheel tread is no more than 2%.
Bearing inspection	Check whether there is grease; there should be no damage or crack.
Oil seal inspection	There shall be no aging.
Gear coupling inspection	Reject when any of the following has occurred: Crackles. Broken gear teeth. The worn of rim thickness amounts to 20% of original thickness.
Surface of wheel quality inspection	Reject when any of the following has occurred: Crackles. The worn wheel rim thickness amounts to 50% of the original thickness. Deflection of flange thickness reaches 20% of original thickness. Wheel tread thickness proportion amounts to 15% of original thickness. When traveling speed ≤ 50 m/min, roundness reaches 1 mm. When traveling speed > 50 m/min, roundness reaches 0.5 mm.
Difference of both sides wheels diameters	Diameter difference of wheel tread ≤ 1%.
Worn condition of wheel shaft	The worn proportion should be less than 2% of the original shaft journal.
Bearing inspection	There should be no damage or crack.

Frame Inspection

Элемент	Стандарт
Deviation degree of span(△S)	S≤10m, △S=±2mm. S>10m, △S=±[2+0.1(S-10)]mm. △Smax=10mm.
Diagonal difference of loading bridge	K≤3m, |S1-S2|≤5mm. K>3m, |S1-S2|≤6m.
Height different of wheel forced on(△h)	S≤10m, △h=±2.5mm, 10<S≤15m △h=±3.5mm, 15<S≤20m △h=±4.5mm, 20<S≤25m △h=±5.5mm, 25<S≤30m △h=±6.5mm, 30<S≤35m △h=±7.5mm.

Electric Hoist Inspection

Мотор Inspection

Элемент	Стандарт
The rising temperature of motor inspection	The rising temperature for E grade insulation motor should be no more than 115℃. The rising temperature for F grade  insulation motor should be no more than 155℃.
Abnormity inspection of motor	Check whether the motor starts grudgingly or whether there is abnormal sound.

Brake Inspection

Элемент	Стандарт
Brake performance inspection	Brake performance should be safe and reliable and act flexibly.
Brake parts quality inspection	Reject when any of the following has occurred: CracklesWorn proportion of brake ring amounts to 50% of original thickness.The spring has plastic deformation. Worn proportions of axis hole diameter amounts to 5% of original diameter.
Brake wheel quality inspection	Brake friction surface of brake wheel should not have the faults or oil stains.Reject when any of the following has occurred: CracklesThe brake ring worn thickness is 40% of original thickness, wear of the running brake wheel reach 50% of original thickness.

Reducer Inspection

Элемент	Стандарт
Installation state inspection	Joint bolt should not be loose.
Gear quality inspection	Reject when any of the following has occurred:  Crackles. The gear teeth have broken. The corrosive-pitting surface amount to 50% of the mating surface and the depth amounts to 10% of the origin.  The permitted worn proportion of first-level gear amounts to 10% of the origin, and others amounts to 20%, traveling gear amounts to 25%. The exposed gear amounts to 30%.
Reducer appearance inspection	No defect like damage.
Sealing quality inspection	No leakage.
Anomaly inspection	Abnormal sound and abnormal heating  are forbidden.
Inspection of other reducer parts	Any loosening, distortion or unusual wear are all banned to the connection between key and key slot. The worn proportion of gear shaft should  be less than 1% the original shaft journal.  The worn proportion of other shafts should be less than 2% the original shaft neck. Aging and metamorphosis are forbidden. Seamless on the matching surfaces are forbidden.

Drum Device Inspection

Элемент	Стандарт
Fixed condition at the end of steel wire rope inspection	Pressing plate at the end of steel wire rope should not be loosened.
Rope guider working state inspection	The steel wire rope should successfully be let out from rope guide when empty hook is descending.
Drum inspection	Reject when any of the following has occurred: Crackles. Worn proportion of drum wall amounts to 20% of the original thickness.

Pulley Inspection

Элемент	Стандарт
Pulley groove appearance inspection	Block groove should be smooth and there should be no limitation.
Block rejection standards	Reject when any of the following has occurred: Crackles. Uneven wear of block groove amounts to 3mm. Wear of groove wall amounts to 20% of the origin. The worn of the bottom of block groove proportion amounts to 50% of the wire rope diameter.  Any defects damage the wire rope.

Wire Rope Inspection

Элемент	Стандарт
Wire rope quality inspection	wire scrap specific requirements can reference ISO 4309-2017.

Hook Inspection

Элемент	Стандарт
Hook quality inspection	Reject when any of the following has occurred: Crackles. Wear and tear of dangerous section is more than 10% of original dimension.  Open degree is more than 15% of the original dimension.  Twisted deformation is more than 10% the original dimension.  Dangerous section or neck of hook occurs plastic deformation.

Traveling Wheels of Hoist

Элемент	Стандарт
Wheel quality inspection	Reject when any of the following has occurred: Crackles The worn wheel rim thickness should be no greater than 50% the original thickness. The worn width proportions should be greater than 5% of max diameter of original wheel.
Clearance limit between wheel rim and rim of I-steel	Max. Clearance should be not more than 50% of the wheel tread width.

Electrical Equipment Inspection

The Power Entry Device Inspection

Элемент	Стандарт
Bare feed slide wire security check	Same to monthly inspection.
Sliding surface inspection	Same to monthly inspection.
Insulation device inspection	Same to monthly inspection.
Flexible cable entry device	Same to monthly inspection.
Safety sign of slide line inspection	Same to monthly inspection.

Collector Inspection

Элемент	Стандарт
Wear and tear state	Same to monthly inspection.
Steady state	Same to monthly inspection.
Rotation condition of collector pulley	Same to monthly inspection.
Collector spring in spection	Same to monthly inspection.

Wiring Inspection

Элемент	Стандарт
Wiring appearance inspection	Same to monthly inspection.
Steady condition	Same to monthly inspection.
Flexible movement inspection	Same to monthly inspection.
Stretch performance of flat cable inspection	Same to monthly inspection.

Electromagnetic Contactor Inspection

Элемент	Стандарт
Contact point and iron core inspection	Same to monthly inspection.
Wiring fixed state	Same to monthly inspection.
Contactor inspection	Same to monthly inspection.

Pendent Inspection

Элемент	Стандарт
Appearance inspection	Same to monthly inspection.
Abnormal failure inspection	Same to monthly inspection.

Lifting Limiter Switch Inspection

Элемент	Стандарт
Action inspection	Same to monthly inspection.
Electric shock inspection	Same to monthly inspection.
Wiring fixed state	Same to monthly inspection.
Limit location inspection	Same to monthly inspection.

Commissioning

Тест без нагрузки

Элемент	Стандарт
No-load test running	Operate the crane to move forward and backward, the trolley to move left and right, and the hoist to lift and lower. Check for any abnormalities and ensure that the operations match the button labels
Safety device check	Check the lifting limit switch, travel limit switch, and other safety devices to ensure their actions are sensitive, safe, and reliable.

Нагрузочный тест

Элемент	Стандарт
Rated load test	The vertical deflection of the main beam must not exceed the specified values in the safety standards for various types of cranes with hoist.
Overload test	When lifting 125% of the rated load, the main beam must not show any signs of permanent deformation, cracks, paint peeling, loosening, or damage after unloading.
Тест динамической нагрузки	Lift 1.1 times the rated load at mid-span and perform only hoisting, lowering, and crane travel operations. Within the specified time, all mechanisms should operate smoothly, flexibly, and reliably without any abnormalities.

Lubricating Maintenance

All moving parts of the crane that require lubrication must be lubricated regularly. The lubrication system should be inspected to ensure that the lubricant is being delivered smoothly. The lubrication points, frequency, and type of lubricant used should follow the manufacturer’s recommendations. Lubricant should only be applied when the crane is stationary.

Functions of Lubricating Maintenance

• Control friction
• Reduce wear
• Lower operating temperature
• Prevent rust and corrosion
• Improve sealing performance

Lubricating Methods

• Dispersed lubrication: Using oil cups, grease nipples, grease guns, etc.
• Centralized lubrication
  • Manual glycerin lubrication: Using oil pumps, lubricators, and oil filters.
  • Electric glycerin lubrication: Using motors, reducers, pumps, and oil reservoirs.
  • Oil bath lubrication points: Inside the gearbox housing.

Common Lubrication Points

• Bearings at the hook nut
• Bearings of moving and fixed pulleys
• Wire ropes
• Drum shaft-end bearings
• Bearings at all rotating points
• Gears inside reducers
• Gears at couplings
• Contact points of the brake
• Подшипники двигателя
• Wheel bearings, etc.