18
Table 10 - Troubleshooting Guide (Continued)
Symptom
Possible Cause
Solution
4. Motor does not run
when either pendant
button is depressed.
a. Air supply valve in the CLOSED
position.
Move valve lever to the OPEN position. Check that filter/regulator gauge
indicates pressure.
b. Insu
ffi
cient compressed air pressure.
Check air pressure at filter/regulator. Increase regulator setting if pressure
shown on gauge is too low. Do not exceed 120 psi [8,3 bar].
c. Insu
ffi
cient compressed air volume.
If necessary, increase volume of compressed air or increase size of supply
air line to meet airflow and pressure requirements.
NOTICE:
If pressure gauge reading drops a large amount (more than about
40 psi [2,75 bar]) when either pendant button is depressed, it is an indication
that the available compressed air volume may be too low.
d. Air mu
ffl
er restricted by ice or debris.
Check air mu
ffl
er for ice or debris. Replace mu
ffl
er if clogged.
Refer to step 10 of Troubleshooting chart if ice is present.
e. Moisture in compressed air causing
ice formation in motor.
Be sure that compressed air is clean, dry and free of water.
Refer to step 10 of Troubleshooting chart if ice formation is present or
suspected.
f. Pendant damaged.
Have pendant assembly inspected by Enerpac Authorized Service Center.
Repair or replace components as required.
g. Pneumatic control circuit components
leaking, worn, damaged or out of
adjustment.
Have pneumatic control circuit inspected by Enerpac Authorized Service
Center. Repair or replace components as required.
h. Hydraulic system components
leaking, worn, damaged or out of
adjustment.
Have hydraulic system inspected by Enerpac Authorized Service Center.
Repair or replace components as required.
i
.
Motor physically locked and/or pump
element seized.
Have air motor, hydraulic pump and related components inspected by
Enerpac Authorized Service Center. Repair or replace components as
required.
5. Motor starts when
pendant UP or DOWN
button is depressed,
but cylinder does not
move, or moves only a
small amount.
NOTICE:
When
pendant DOWN
button is depressed,
the cylinder will
move upward a
small amount before
retraction begins. This
is normal operation.
a. Insu
ffi
cient compressed air pressure
or volume.
Check air pressure at filter/regulator. Increase regulator setting if pressure
shown on gauge is too low. Do not exceed 120 psi [8,3 bar].
If necessary, increase volume of compressed air or increase size of supply
air line.
b. Air mu
ffl
er restricted by ice or debris.
Check mu
ffl
er for ice or debris. Replace mu
ffl
er if clogged.
Refer to step 10 of troubleshooting if ice formation is present.
c. Jack is overloaded.
Reduce load or use a di
ff
erent jack of a higher capacity.
d. Cylinder hydraulic control valve not
shifting.
Have control valve inspected by Enerpac Authorized Service center. Repair
or replace components as required.
NOTICE:
A manual override pin is located on each end of the valve. These
overrides can be used to shift the valve to test cylinder retract and extend
operation.
e. Lock nut spin-up sensor dirty
or plugged (this symptom is applicable
to the cylinder advance circuit only).
Have lock nut spin-up sensor checked by Enerpac Authorized Service
Center. Verify that sensor ports and air lines are not dirty or blocked.
f. Cylinder lock nut not turning.
Refer to step 9 of troubleshooting.
g. Pneumatic system air line lubricator is
overfilled.
Drain excess lubricant from air line lubricant bowl. Do not operate jack for
8 to 12 hours to allow excessive lubricant to clear from jack pneumatic
control circuit.
h. Pneumatic control circuit components
leaking, worn, damaged or out of
adjustment.
Have pneumatic control circuit inspected by Enerpac Authorized Service
Center. Repair or replace components as required.
i. Hydraulic system components leaking,
worn, damaged or out of adjustment.
Have hydraulic system inspected by Enerpac Authorized Service Center.
Repair or replace components as required.
6. Cylinder advances
when pendant DOWN
button is depressed.
a. Proximity-2 lock nut position sensor
dirty or plugged.
Have Proximity-2 sensor checked by Enerpac Authorized Service Center.
Verify that sensor ports and air lines are not dirty or blocked.
b. Pneumatic system air line lubricator
is overfilled.
Drain excess lubricant from air line lubricant bowl. Do not operate jack for 8
to 12 hours to clear excessive lubricant from jack pneumatic control circuit.
(Continued on next page)
