Chapter 4 Items for Maintenance and Repair

a) Only the inspection switch boxes should be used during test operations. At the same time, the inspection plugs should be put into the inspection outlets of the controller in either of driving and return stations. Pull the inspection plugs out after inspection.

c) Before entering into an escalator for maintenance and repair, the emergency stop button on the inspection switch boxes or in either of driving and return stations should keep in operation.

d) Avoid the risk of getting an electric shock when repairing the system with the higher voltage than safety.

3.4.1 Periodical maintenance and repair are vital to prevent an escalator to be damaged and to extend the length of its life.

3.4.2 The key factors determining the period of maintenance and repair as follows:

a) Daily: Include maintaining appearance, sanitation and lubrication of an escalator.

b) Light: include inspecting main function, basic cleaning work and lubrication.

c) Heavy: include inspecting all function, all equipments and doing some cleaning and lubrication work relevant to the running performance.

3.4.4 The too long period of maintenance and repair will influence an escalator to operate safely.

a) If the total running time is less than 80 hours per week, an escalator needs the maintenance and repair 4 times annually, including 2 light and 2 heavy.

b) If the total running time is up to 80 hours but less than 120 hours per week, an escalator needs the maintenance and repair 6 times annually, including 4 light and 2 heavy.

c) If the total running time is more than 120 hours per week, an escalator needs the maintenance and repair 8 times, including 4 light and 4 heavy.

If the total running time is more than 250 hours after a new escalator is put in operation, it

needs the first maintenance and repair. And the first maintenance and repair comprises: lubricating all chains completely, cleaning the machine room, fastening the bolts and adjusting the tension of handrails.

No.	Sort	Item	Type of maintenance and repair	Requirements
A	B	C
	Functional Inspection	Balustrades	▲	▲		Safety and reliability
	Safety notices	▲	▲		Safety notices for the users should be stuck to the glass of the access to escalator.
	Three phase power switches	▲	▲		Reliability
	Protection equipments against phase loss	▲	▲		Reliability
	Key switches	▲	▲		Reliability
	Emergency stopping button	▲	▲		Reliability
	★Detecting passengers optical grating	▲	▲		Clean the lens of the detector to insure the reliability.
	Failure and direction display	▲	▲		Display clearly and correctly
	Inspection boxes	▲	▲		Reliability
	Upper stop button	▲	▲		Reliability
	Lower stop button	▲	▲		Reliability
	Machine Room	Controller		▲		Clear and fasten all bolts
	Motor tachogenerator	▲	▲		Reliability
	Brake contact	▲	▲		Reliability
	★Auxiliary brakes		▲		Reliability
	Stopping distances		▲		The stopping distances for unloaded and downward moving loaded escalators shall be between 0.2-1m.
	Stopping equipments		▲		Reliability. Firstly, the braking belt should firmly stick to the surface of the brake wheel during stopping. Then when the brake is Releasing, the gap between the belt of the brake and the brake wheel should be less than 2mm. The belt should be replaced by a new one when the thickness of the belt is less than three-fourths of the original because of friction. The rising temperature of the brake motor should not exceed 105k.
	Inner decking and Outer decking	Outer decking	▲	▲	▲	Clean surface, firm and smooth splices
	Inner decking	▲	▲	▲	Clean surface, firm and smooth splices
	Skirt Panel	Safety switches of skirt panel	▲		▲	Reliability
	Skirt panel splices	▲	▲		Smooth splices
	Skirt panel		▲	▲	Clean surface
	Steps	Step lightning		▲	▲	Clean and inspect
	Guide rail	▲	▲		Inspect working conditions, clean and lubricate
	Step chain roller	▲	▲		Inspect working conditions, clean and lubricate
	Step bearing sleeves		▲	▲	Lubricate
	Step chains	▲	▲	▲	No.68 or No.100 oil is used. The lubricating frequency and the amount of oil are determined according to running conditions.
	Clearance between step chains and skirt panel		▲	▲	At each side: ≤4mm sum at both sides: ≤7mm
	Horizontal guide rail		▲		Inspect working conditions and screw the fastened bolt firmly.
	Step nylon shield		▲	▲	Inspect the working condition, clean and lubricate
	Steps		▲	▲	Its surface is not damaged and ribs on its tread surface is very clean.
	Step chains safety switches	▲	▲		Reliability. And the switch clearance is 2mm wide.
	Step entrances		▲		Inspect working conditions of the steps position (both the horizontal part and the inclining part)
	Step drive chain tension	▲	▲		Adjust the compression of the spring to synchronize the right of the steps with the left
	Step sagging contact		▲		A still escalator should not be started in case the contact is turned off.
	Combs And Front Tread	Comb teeth		▲	▲	If two continuous teeth are broken, the combs should be replaced.
	Crossing-head screw			▲	Rustproof: Release and lubricate all screws in the combs
	mesh between the comb teeth and the steps.	▲	▲	▲	Pass freely without collision, the gap between the teeth and the grooves is 3-4mm
	Pallets	▲	▲		Inspect if the pallets can move, and if its surface is clean and its teeth are aligned. Bend down the combs and adjust the compressing spring, then place a screw wrench between the steps and the pallets. And hand wind until the pallets can move backward.
	Pallets side guide rail		▲		Clean and lubricate
	Pallets safety switch	▲	▲	▲	Reliability
	Front tread	▲	▲	▲	Inspect if the edges are aligned and the surface is clean.
	Handrail Coefficient	Handrail	▲	▲	▲	It runs normally with a smooth and clean surface and a appropriate tension.
	Handrail pulley group.		▲	▲	Inspect working conditions and clean.
	Interior part of handrail		▲		Inspect if the sliding surface is worn.
	Handrail bearing roller		▲		Inspect working conditions and clean the surface.
	Handrail tension device	▲	▲		The handrail has an appropriate tension. And its pulley is in a good working condition.
	Handrail entrance contact	▲	▲		A running escalator should be stopped at once in case of touching the contact.
	Handrail fence(glass)	▲	▲		It is clean with a symmetric gap.
	Tension of handrail drive chain	▲	▲		The handrail has an appropriate tension with a 10mm sag at its loose side.
	Tension sheave		▲		It has an appropriate tension. Make a stop test to the handrail with a hand force of 70kg.
	Speed of the handrail		▲		Not less than the speed of the steps.
	Main Drive Chains	Main drive chains	▲	▲		It has a good lubrication and an appropriate tension. The sag of the loose side of the handrail is 8mm.
	Protection device for main drive chains	▲	▲		Work reliably and turn agilely. Its switch gap is 10mm.
	Automatic Lubricating system	★Automatic lubricating system	▲	▲	▲	Reliability
	★Oil level of the automatic lubricating system	▲	▲	▲	Inspect the oil level and fuel.
	★Oil brush		▲	▲	Inspect its working conditions and its installing position,then make some adjustment.
	Others	Cable		▲	▲	The cable is not worn and fixed firmly.
	Motor		▲	▲	Water and oil should be prevented form entering the inside of the motor. The rising temperature of the motor should be less than 105k.Its temperature should not be more than 80℃ when the bearings on both sides are working normally. The motor is allowed to give off the slight noise as it is running, or we should stop and examine it.
	Oil level of the gear box and Period of replacing oil		▲	▲	The lubricant should be clean and the rising temperature should not exceed 85k. The oil level should locate between the upper and lower limit of the oil level gauge. There is no oil leak. The lubricant should be replaced after 340 hours’ operation in the first-running escalator, and then be replaced per 680 hours. The lubricant type is No.460 industrial gear oil.
	Sanitation of both machine rooms in an escalator.	▲	▲		Clean without oil waste or sundries.
	Pit of an escalator		▲	▲	Without oil waste, sundries or water.
	Appearance of an escalator	▲	▲	▲	Clean

NOTE： ① Types of maintenance and repair: A-Light (per month); B-Heavy (per six month indoor, per three month outdoor); C-Changeable period (according to the running time and working conditions.) ②The item marked “★” is optional according to contracts and the item marked “▲” is required. ③ The items, which are not in the list, should be maintained according to the practical working conditions.