9
7.0 TROUBLESHOOTING
The information in the Troubleshooting Guide (refer to Table 9) is
intended as an aid to help diagnose and correct various possible
problems that may occur.
For repair service, contact your local Simplex authorized service
center. Only a Simplex authorized service center should service
the jack and its components.
CAUTION:
Never tighten or loosen hydraulic fittings
while jack hydraulic system is pressurized.
Table 9 - Troubleshooting Guide
Symptom
Possible Cause
Solution
1. Sporadic cylinder
action.
Air trapped in hydraulic system.
Cycle cylinder up and down several times to bleed trapped air.
Low oil level in hydraulic reservoir.
Add Simplex hydraulic oil as required.
Seal wear and/or other internal damage. Have hydraulic system inspected by a Simplex Authorized Service Center.
Repair or replace components as required.
2. Noisy operation.
Air trapped in hydraulic system.
Cycle cylinder up and down several times to bleed trapped air.
Low oil level in hydraulic reservoir.
Add Simplex hydraulic oil as required.
Air leaks in hydraulic system.
Check all points where air might leak into system.
Clogged or blocked pump intake
screen.
Have hydraulic reservoir and intake screen flushed and cleaned by a
Simplex Authorized Service Center.
3. Oil is overheating.
Low oil level in hydraulic reservoir.
Add Simplex hydraulic oil as required.
Oil viscosity too high or too low.
Drain and refill reservoir with Simplex hydraulic oil.
High pressure leakage at the pump.
Have hydraulic system inspected by a Simplex Authorized Service Center.
Repair or replace components as required.
4. Pump runs but will not
pump oil.
OR
Cylinder moves but
will not lift load.
Seal wear and/or other internal damage. Have hydraulic system inspected by a Simplex Authorized Service Center.
Repair or replace components as required.
Control valve needs repair.
Have control valve inspected by a Simplex Authorized Service Center.
Repair or replace as required.
5. Cylinder extends but
will not retract.
Insufficient compressed air volume.
Check air regulator setting. Increase volume of compressed air or increase
size of supply air line to meet airflow and pressure requirements.
Internal pressure leaks, or leaking retract
hoses.
Have hydraulic system inspected by a Simplex Authorized Service Center.
Repair or replace components as required.
Internal relief valve setting or retract side
relief valve setting too low.
Have hydraulic system inspected by a Simplex Authorized Service Center.
Repair or replace components as required.
Defective over-center valve, secondary
lock valve or control valve.
Have hydraulic system inspected by a Simplex Authorized Service Center.
Repair or replace components as required.
Pump not developing enough pressure.
Have hydraulic system inspected by a Simplex Authorized Service Center.
Repair or replace components as required.
6. Pump does not run.
Insufficient compressed air volume.
Check air regulator setting. Increase volume of compressed air or increase
size of supply air line to meet airflow and pressure requirements.
Moisture in compressed air.
Be sure that compressed air is clean, dry and free of water.
Air muffler frozen or clogged with ice.
Clean the air muffler. Be sure compressed air is clean, dry and free of
water. Check lubricant level in air line lubricator. Use only SAE 10 [ISO 32]
detergent oil or an approved antifreeze lubricant.
Air motor frozen or clogged with ice.
Be sure compressed air is clean, dry and free of water. Check lubricant level
in air line lubricator. Use only SAE 10 [ISO 32] detergent oil or an approved
antifreeze lubricant.
Air motor corroded, damaged, worn or
seized.
Have air motor inspected by a Simplex Authorized Service Center. Repair
or replace as required.
Pump element damaged, worn or
seized.
Have pump element inspected by a Simplex Authorized Service Center.
Repair or replace as required.
7. Jack is difficult to
roll on wheels.
Low tire inflation pressure.
Check tire inflation pressure. Add air if low.
Pressure should be 90 psi [6,2 bar].
Wheel bearings need lubrication.
Apply grease to wheel bearings. See Section 6.6.
Wheel locknut out of adjustment.
Loosen locknut until wheel rotates freely.
