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Electric Chain Hoists (Single Brake)
Model NECH
PAGE: 41
NECH-0214
ACI Hoist & Crane | 2721 NE 4th Ave Pompano Beach, FL 33064| 954.367.6116
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8.
Parting of replacement chain must be the same as the original parting of chain on the hoist. Refer to Figure
6.6.2 for parting arrangement of hoists.
9.
Replacement chain must be installed without any twist between the hoist and an anchored end on either the
loaded or slack (unloaded) side of the driving sheave.
Figure 6.6.2
10.
To check the load chain for twists, raise the load block without a load to within three feet of driving load
sheave. Check the links. Welds must be away from the driving load sheave grooves and toward the load
block sheave grooves.
11.
Do not use hoist until replacement load chain has been lubricated. Refer to the lubrication section of this
manual.
6.7
Hoist Motor Brake Inspection
The hoist breaking system on hoists in regular service should be checked without load on the hook by the operator at
the start of each shift, or before the first time the hoist is to be operated during each shift. The hoist braking system
should be checked during scheduled frequent and periodic inspection.
During daily, frequent or periodic inspections, the hoist braking system should be checked by operating the hoist in the
lifting and lowering directions, without a load on the hook, and stop the hook motion to check operation of the hoist
braking system. The hook’s drift should not exceed ¼ inch in either direction. If the hook drifts exceeds 1.4 inch, the
motor brake requires adjustment or the lining requires replacement. Refer to section 7.4 Hoist Motor Brake Adjustment
for further details.
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 load chain drift during operation, 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 pad assembly
and/or motor cover if necessary. For normal inspections, the brake lining should be measured and the motor cover wear
should be inspected. Compare the measurement with the values listed in Table 6.7.1. Replace the brake pad assembly if
the measurement is smaller than the replacement limit. Refer to section 7.5 Hoist Motor Brake Disassembly.
DO NOT
operate a hoist with a twist in the load chain. Operating a hoist with a twist in the
load chain can cause the load chain to break and result in serious bodily injury or death
and/or property damage.