Electric Chain Hoists (Single Brake)
Model NECH
PAGE: 42
NECH-0214
ACI Hoist & Crane | 2721 NE 4th Ave Pompano Beach, FL 33064| 954.367.6116
Visit WWW.ACIHOIST.COM for the most current information
Table 6.7.1
HP
Brake Disc Thickness
Nominal
Replace
1
0.177
0.159
2
0.177
0.159
3
0.217
0.195
6.8
Trolley Inspection
Trolleys specified for the ACI electric chain hoist line include:
•
Push under-running trolleys
•
Hand-geared under-running trolleys
•
Motor-driven under-running trolleys
The trolley should be inspected every three months and during scheduled frequent and periodic inspections as follows:
1.
Inspect trolley wheel bearings for wear by manually rotating and rocking wheels. If excessive bearing play is
present, replace bearings.
2.
Inspect for wear, flat spots or damage to wheel tread and cracked or broken wheel flanges. Replace wheels
as required. When wheel replacement is required, all the wheels of a trolley should be replaced.
3.
Inspect gear teeth of geared wheels and pinion for wear, cracks or damage. Replace geared wheels or
pinion as required. Geared wheels should always be replaced in pairs.
4.
Inspect and tighten or replace as required, all bolts, nuts and locking devices.
5.
Check lubrication in accordance with the Lubrication section of this manual.
The Trolley brake (if specified) on hoists in regular service should be checked without a load on the hook by the
operator. At the start of each shift or the first time the hoist is to be operated during each shift. The trolley brake should
be checked during scheduled frequent and periodic inspections.
During daily, frequent or periodic inspections, the trolley brake should be inspected as follows:
•
Operate the trolley in both travel directions, without a load on the hook, and stop the motion to check operation
of the trolley brake. The drift of the trolley should not exceed a distance equal to 10% of the
trolley’s
travel speed
in either direction. If trolley drift exceeds this distance, the motor brake normally requires lining replacement.
•
After completing trolley brake lining replacement, operate trolley in both travel directions, without a load on the
hook, and stop motion to check operation of the trolley brake. If the trolley drift is still excessive, replace the
brake assembly.
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, disassemble the motor brake and inspect all motor brake parts.
Brake surfaces should be clean, free of grease/oil and should not be glazed. Replace the brake assembly and/or motor
cover if necessary. Inspection of the motor brake requires removal of the motor brake unit from the trolley as an
assembly. Refer to the Electric Trolley Assembly Drawing, Figure 10.5.1, remove the motor brake as follows: