Service Manual Owner's manual

SECTION 3 - TROUBLESHOOTING

3-36 – JLG Lift – 3120728

Platform (Mast) Descends Too Slowly

Overview Of Procedure

The following procedure examines the mast some hydraulic components for obstructions and defects.

Table 3-30. Platform (Mast) Descends Too Slowly.

STEP ACTION SPEC YES NO

1. Check mast slide pads shimmed to tight. — Reshim Mast Go to Step 2

2. Is there an obstruction in the mast?

—

Remove

Obstruction

Go to Step 3

3. The lift cylinder packing could be too tight in the bore of the cylinder

barrel.

—

Rebuild or

Replace Cylinder

Go to Step 4

4. Check the flow valve on the extend hydraulic line for a restriction, i.e.

dirt.

—

Clean or Replace

Flow Valve

Go to Step 5

5. Check if the lift down valve is opening completely.

—

Clean or Replace

Valve

Go to Step 6

6. Is there a restricted hydraulic line (smashed)?

—

Replace Hydrau-

lic Line

—