Paccar Braden PD12C, Инструкция по установке, обслуживанию и ремонту, Страница: 14 / 40

14
TROUBLE PROBABLE CAUSE REMEDY
D
Th e hoist will not hoist the rated load. 1. Th e hoist may be mounted on an un-
even or fl exible surface which causes
distortion of the hoist base and binding
of the gear train. Binding in the gear
train will absorb horsepower needed to
hoist the rated load and cause heat.
2. System relief valve may be set too low.
Relief valve needs adjustment or repair.
3. Be certain hydraulic system tem-
perature is not more than 180 degrees
F. Excessive hydraulic oil temperatures
increase motor internal leakage and re-
duce motor performance.
4. Hoist line pull rating is based on 1st
layer of wire rope.
5. Rigging and sheaves not operating ef-
fi ciently.
1. Mounting Surface:
a. If necessary, use shim stock to level
hoist. Refer to “Hoist Installation”.
b. First loosen, then evenly retighten all
hoist mounting bolts to recommended
torque.
2. Check relief pressure as follows:
a. Install an accurate 0-4000 psi (27,580
kPa) gauge into the inlet port of the
brake valve.
b. Apply a stall pull load on the hoist
while monitoring pressure.
c. Compare gauge reading to hoist spec-
i fi cations. 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 replacement.
3. Temperature:
a. Same as remedies for PROBABLE
CAUSE D1 & D2.
b. Same as remedies for PROBABLE
CAUSE E2.
4. Refer to hoist performance charts for
additional information.
5. Perform rigging service as recom-
mended by crane manufacturer.
E
Th e hoist runs hot.
1. Same as PROBABLE CAUSE D1.
2. Be certain that the hydraulic system
temperature is not more than 180 de-
grees F. Excessive hydraulic oil temper-
atures may be caused by:
a. Plugged heat exchanger.
b. Too low or too high oil level in hy-
draulic reservoir.
c. Same as D2.
1. Same as REMEDY D1.
2a. Th oroughly clean heat exchanger
exterior and fl ush interior.
b. Fill/drain to proper level.
c. Same as REMEDY D2