Platform (Mast) Descends Too Slowly - JLG 10VP Service And Maintenance Manual

SECTION 3 - TROUBLESHOOTING

Platform (Mast) Descends Too Slowly

Overview Of Procedure
The following procedure examines the mast some hydraulic components for obstructions and defects.
STEP
1. Check mast slide pads shimmed to tight.
Is there an obstruction in the mast?
2.
3. The lift cylinder packing could be too tight in the bore of the cylinder
barrel.
Check the flow valve on the extend hydraulic line for a restriction, i.e.
4.
dirt.
Check if the lift down valve is opening completely.
5.
6. Is there a restricted hydraulic line (smashed)?
3-40
Table 3-30. Platform (Mast) Descends Too Slowly.
ACTION
– JLG Lift –
SPEC YES
— Reshim Mast
Remove
—
Obstruction
Rebuild or
—
Replace Cylinder
Clean or Replace
—
Flow Valve
Clean or Replace
—
Valve
Replace Hydrau-
—
lic Line
NO
Go to Step 2
Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 6
—
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