Harrington Hoists and Cranes MR Trolley - (MR2) - Manual (Page 45)

6.1.2 Gear Lubricant – The Dual Speed Trolley C/H Meter can be used in conjunction with the average
operation of the trolley to estimate when the gear lubricant should be changed. Refer to Section 6.2.3.
6.1.3 You are encouraged to use the Dual Speed Trolley Count/Hour Meter in conjunction with your
experience with the trolley's application and usage to develop a history upon which to gage and fine
tune your maintenance program for the trolley.
6.2 Lubrication
6.2.1 Lubricate the following trolley components with NLGI (National Lubricating Grease Institute) #2 or
equivalent grease.
6.2.2 Track Wheel Gear – Clean and re-grease the Track Wheel gears and motor output pinion every three
months (more frequently for heavier usage or severe conditions). Do not use an excessive amount of
grease and avoid getting any grease on the running surfaces of the Track Wheels or the beam.
6.2.3 Gear Box – The reduction gearing in the 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. Gain access to the gears by removing the four bolts that mount the motor
assembly to the trolley Side Plate. Make sure to properly orient and reuse the neoprene gasket
between the motor and Side Plate.
6.2.4 Suspension Pins, Bolts and Shafts – Grease at least twice per year for normal usage (more frequently
for heavier usage or severe conditions).
6.3 Brake
6.3.1 The trolley motor brake is NOT adjustable.
6.3.2 Motor Brake Removal – Remove the four Bolts that attach the Motor Cover to the Motor Frame.
Carefully remove the Motor Cover, brake components, and Stator.
6.3.3 Brake Lining Inspection – The brake lining is designed for a long life and should provide years of
trouble-free service. If the brake lining is being inspected due to excessive trolley drift during operation
(see Section 5.7), disassemble the motor brake and inspect all motor brake parts. Braking surfaces
should be clean, free of grease/oil and should not be glazed. Replace the Brake Drum and/or Motor
Cover if necessary. For normal inspections, the Brake Lining and Motor Cover wear should be
measured as follows.
1) Refer to Table 5-6.
2) Measure the distance "A" using calipers and a straight edge. Make sure the Brake Drum is square
against the Motor Cover. Place the straight edge across the edge of the Brake Drum and measure
from the straight edge to the mounting face of the Motor Cover.
3)
Compare the measurement with the values listed in Table 5-6. Replace the Brake Drum and/or
Motor Cover if the "A" measurement is smaller than the discard limit.
6.3.4 Motor Brake Installation - After the brake is inspected, carefully place the Stator and brake components
into the Motor Frame. Be sure to reseal the Motor Cover to Motor Frame surface using a small bead of
liquid (hi-temperature) sealant. Install the Motor Cover attachment bolts.
6.4 Storage
6.4.1 The storage location should be clean and dry.
6.4.2 Care should be take to not damage any of the electrical power cords or fittings.
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