Harrington Hoists and Cranes (N)ER Hoist - ((N)ER1) - Manual (Page 29)

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6.0 Maintenance and Handling
6.1 Count/Hour Meter
6.1.1 The Count/Hour (C/H) Meter located in on the electrical control panel records the hoist's on time and
number of starts. To view the two values press the button on the C/H Meter one time. The display will
first show an "H" and a 4 digit number which is the hoist's total on time (up and down) in hours. After 3
seconds the display will automatically change to a 6 digit number which is the number of starts of the
hoist's down contactor. Refer to
Figure 6-1 .
Figure 6-1 Count/Hour Meter
6.1.2
Contactor – The C/H Meter can be used in conjunction with the amount of jogging to estimate when the
contactor(s) should be replaced. Jogging is when the pendant control buttons are pressed quickly and
repetitively to move the hook in small increments. Refer to
Table 6-1 .
Table 6-1 Criteria for Recommended Contactor Replacement
Jogging During Normal Operation Change Contactor After:
(starts) Rating Approximate Jogging Frequency
Low Jogging is rare. 1,000,000
Medium During 25% of operations/lifts. 500,000
High During 50% or more of operations/lifts. 200,000
6.1.3 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 6-2 .
Table 6-2 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
6.1.4 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.