27
T
ROUBLE
“E”
CONTINUED
FROM
P
REVIOUS
P
AGE
D.Hydraulic pump not operating effi-
ciently.
3. Excessively worn or damaged internal
hoist components.
4. Excessive back pressure may be act-
ing on the free flow check valve within
the brake valve.
Prime mover low on horsepower or
RPM. Tune or adjust prime mover as
required.
Check suction line for damage. Repair
as needed.
If pump is belt driven, ensure belts are
tensioned properly and not slipping.
Pump worn. Repair or replace as
required.
Disassemble hoist and inspect. Replace
worn or damaged items as needed.
Same as A7.
F
The hoist "chatters"
while raising the rated
load.
1. Same as D2.
2. Hydraulic oil flow to motor may be
too low.
3. Control lever possibly being moved
too quickly.
4, Same as A4.
5. Same as A5.
6. Same as A6
Same as D2.
Same as E2.
Controls should be operated smoothly.
Moving the lever too quickly into the full
open position can cause surging in the
hydraulic system. Conduct operator
training as required.
Same as A4.
Same as A5.
Same as A6
G
The hoist fails to raise
the load.
1. The hydraulic motor may be worn.
2. Same as A4.
3. Same as A5.
4. Same as A6.
Install 0-4000 PSI (0-27,800 kPa) pres-
sure gauges to the inlet and outlet ports
of the motor. Apply a stall load to the
hoist and compare the gauge readings.
If the difference is excessive, repair or
replace the motor as required.
Same as A4.
Same as A5.
Same as A6.
TROUBLE
PROBABLE CAUSE
REMEDY
