Harrington Hoists and Cranes Series 3 End Truck - Manual (Page 45)

7.0 Maintenance and Handling
7.1 General
Components of your End Trucks that require maintenance are as follows:
For Motorized End Trucks:
 Reduction Gearing in the Gear motor
 Brake Assembly in the Gear motor
 End Truck Drive Gears
For Geared End Trucks:
 End Truck Drive Gears
For Manual End Trucks:
 No items that require maintenance
7.2 Gear Motor - Reduction Gears
a) The reduction gearing in the gear motor should be cleaned and lubricated at least once per
year for normal usage. Clean and lubricate the reduction gear assembly more frequently for
heavier usage or severe conditions.
b) To clean and lubricate the reduction gearing in the gear motor refer to Figure 7-1 and
disassemble as follows:
(1) Detach the socket bolts 313.
(2) Disassemble gearbox A 303 from gearbox B 401.
(3) Remove gearbox packing 310.
(4) Clean components and re-lubricate using an approved lubricant from Table 6-1 in Section
6.
c) Reassemble as follows:
(1) Reassemble in reverse order of the disassembly procedure.
(2) Coat the threaded portion of the socket bolts 313 with, Loc-Tite, or similar glue.
(3) Once assembled, free the brake and ensure that the gears are meshed properly by
turning the pinion by hand.
7.3 Gear Motor - Brake
a) The brake in the gear motor should be cleaned, parts lubricated and adjusted at least once
per year for normal usage. Clean and lubricate the reduction gear assembly more frequently
for heavier usage or severe conditions. DO NOT disassemble the motor itself.
b) To clean, lubricate and adjust the brake in the gear motor refer to Figure 7-1 and
disassemble as follows:
(1) Remove the electromagnetic coil assembly 5610 by detaching the socket bolts 607.
(2) As the electromagnetic coil assembly 5610 is wired to the terminal box of the motor, be
careful when handling the wiring.
(3) Remove the spring holder 605, brake spring 606, armature 513 and brake disk 512.
(4) Lightly grease the spline of the brake disk 512 and sliding parts of the armature 513 with
MORISPEED grease No. 2 or similar.
(5) Inspect the brake disc for wear and replace if necessary. Refer to Tables 5.3 and 5.7.
Do not allow grease or oil on the brake disc surface.
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