SYMPTOM

CAUSE

SOLUTION

Abnormal noise

Abrasion exists on insider surface of the posts. Trash in the post.

Grease the inside of the post. Clear the trash.

SYMPTOM

CAUSE

SOLUTION

Motor does not run and will not rise

The wire connection is loose. The motor is blown. The limit switch is damaged or the wire connection is loose.

Check the wire connection. Clean or adjust it. Replace it. Connect it or adjust or replace the limit switch.

SYMPTOM

CAUSE

SOLUTION

The motor run reversely. Overflow valve is loose or jammed. The gear pump is damaged. Oil level is too low. The oil hose became loose or dropped off. The cushion valve became loose or jammed.

Check the wire connection. Clean or adjust it. Replace it. Add oil. Tighten it. Clean or adjusts it.

Motor runs but will not raise

SYMPTOM

CAUSE

SOLUTION

The oil hose leaks. The oil cylinder is not tightened. The single valve leaks. Solenoid valve fails to work well. Steel cable is loose or not with same tightness.

Check or replace it. Replace the seal. Clean or replace it. Clean or replace it. Check and adjust the tightness.

Carriages go down slowly after being raised

SYMPTOM

CAUSE

SOLUTION

The oil filter is jammed. Oil level is too low. The overflow valve is not adjusted to the right position. The hydraulic oil is too hot ( above 45°）. The seal of the cylinder is abraded. Inside surface of the posts is not well greased.

Clean or replace it. Add oil. Adjust it. Change the oil. Replace the seal. Add grease.

Raising too slow

SYMPTOM

CAUSE

SOLUTION

The throttle valve jammed. The hydraulic oil is dirty. The anti-surge valve jammed. The oil hose jammed.

Clean or replace. Change the oil. Clean it. Replace it.

Lowering too slow