BRADEN CH280 Installation Maintenance And Service Manual page 18

TROUBLE
TROUBLE "D" CONTINUED FROM
PREVIOUS PAGE
The hoist will not raise the rated
load.
E
PROBABLE CAUSE
3. Be certain hydraulic system tem-
perature is not more than 180°F
(82°C). Excessive hydraulic oil
temperatures increase motor in-
ternal leakage and reduce motor
performance.
4. Hoist line pull rating is based on
first layer of wire rope.
5. Rigging and sheaves not operating
efficiently.
1. Same as D1.
2. Be certain that the hydraulic sys-
tem temperature is not more than
180°F. Excessive hydraulic oil
temperatures may be caused by:
A. Plugged heat exchanger.
B. Too low or too high oil level in hy-
draulic reservoir.
C. Same as D2.
D. Hydraulic pump not operating ef-
ficiently.
3. Excessively worn or damaged in-
ternal hoist parts.
18
REMEDY
B. Apply a stall pull load on the hoist
while monitoring pressure.
C. Compare gauge reading to hoist
specifications. Adjust relief valve
as required.
NOTE: If pressure does not increase
in proportion to adjustment, relief
valve may be contaminated or worn
out. In either case, the relief valve
may require disassembly or replace-
ment.
Same as remedies for Trouble D1
and D2.
Same as remedies for Trouble E2.
Refer to hoist performance charts for
additional information.
Perform rigging service as recom-
mended by crane manufacturer.
Same as remedies for Trouble D1.
Thoroughly clean exterior and flush
interior.
Fill/drain to proper level.
Same as remedies for Trouble D2.
Prime mover low on horsepower or
RPM Tune/adjust prime mover.
Check suction line for damage.
If pump is belt driven, belts are slip-
ping. Replace/tighten belts.
Pump worn. Replace pump.
Disassemble hoist to inspect/replace
worn parts.