Harrington Hoists and Cranes (N)ER Hoist - ((N)ER2) - Manual (Page 41)

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6.1.4 Gear Oil – The C/H Meter can be used in conjunction with the average load lifted by the hoist to estimate
when the gear oil should be changed. Refer to Table 6-4.
Table 6-4 Criteria for Recommended Gear Oil Replacement
Loading During Normal Operation Change Gear Oil After:
(hours) Rating Average % of Rated Capacity
Light 0 to 33% 360
Medium 33 to 67% 240
Heavy 67 to 100% 120
6.1.5 Electromagnetic Brake – The C/H Meter can be used to determine when the Electromagnetic Brake
should be monitored or replaced. Refer to Table 6-5.
When 1 Million starts have been achieved, inspect brake gap referring to Table 6.5 criteria.
When 2 Million starts have been achieved, replace brake assembly regardless of brake gap.
Table 6-5 Criteria for Electromagnetic Brake Replacement
Condition of Electromagnetic Brake Gap
(Ref. Table 5-7 for Gap Wear Dimension)
Action
Brake gap is less than 50% of the limit. Check the Brake at every 200,000 starts.
Brake gap reaches 50 to 100% of the limit.
Check the Brake at every 100,000 starts until the brake
gap reaches at the limit gap.
Brake gap reaches the limit. Replace whole Brake
6.1.6 Hook and Yoke – The C/H Meter can be used to determine when the Top/Bottom Hook and Yoke
should be replaced. Refer to Table 6-6.
Table 6-6 Criteria for Top/Bottom Hook and Yoke Replacement
Rate of Loading Number of Starts to replace Hook and Yoke
Light - The hoist is mostly used with a light load.
Rated capacity rarely applied.
Every 2 million starts.
Medium – The hoist is mostly used with a medium load.
Rated capacity frequently applied.
Every 1.5 million starts.
Heavy – The hoist is mostly used with a heavy load.
Rated capacity frequently applied.
Every 1 million starts.
Ultra-Heavy – Rated capacity constantly applied. Every 1 million starts.
6.1.7 V Ring – The C/H Meter can be used to determine when the V Ring should be lubricated. Several
grams of MOLITHERM No. 2 grease should be applied to the V Ring every 200 hours of operation.
6.1.8 You are encouraged to use the Count/Hour Meter in conjunction with your experience with the hoist's
application and usage to develop a history upon which to gage and fine tune your maintenance program
for the hoist.
6.2 Lubrication – Load Chain, Hooks and Suspension
6.2.1 Load Chain
 For longer life, the load chain should be lubricated.
 The load chain lubrication should be accomplished after cleaning the load chain with an acid free
cleaning solution.