Lull 944E-42 Service Manual User Manual download pdf (Page 321)

100

101

8.69

Model 644E-42/944E-42 Rev. 6/04

Hydraulic System

Not

If park brake fails to hold, check

the “PBG” port on the

accumulator charge/secondary

function valve. Should read 0 psi.

If park brake fails to release,

check the “PBG” port on the

accumulator charge/secondary

function valve. Should read

500-600 psi (34,5-41,4 bar).

Check pressure reducing

cartridge on accumulator charge/

secondary function valve.

Refer to Section 9.14.6,

“Parking Brake Switch.”

Not

Within the front axle:

If not holding, check the park

brake springs.

If not releasing, check the

piston seals.

Refer to ZF Axle Repair

Manual, Model MS-T 3045,

ZF part # 5871 550 002. JLG

part # 8990419 (644E Only)

or ZF Axle Repair Manual,

Model MS-T 3060, ZF part #

5871 560 002. JLG part #

8990430 (944E Only)

Install seal kit/replace

solenoid valve cartridge.

If OK

Adjust/repair/replace

pressure reducing cartridge.

If OK

Check solenoid valve

cartridge.

Check solenoid valve on the

accumulator charge/

secondary function valve.

If OK

NOTE:

When checking pressures in

circuits, refer to Section 8.7,

“Hydraulic System Testing,” for

correct pressure readings.

Not

Check front brake discs for

wear.

Refer to Section 5.6.1, “Brake

Disc Inspection.”

If OK

Before troubleshooting any

hydraulic circuit, ALWAYS

begin by checking the

following:

1. Hydraulic oil level in the

reservoir

2. All hoses, tubes, fittings

for leaks, kinks,

interference, etc.

3. Air in the lines

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Lull 944E-42 Service Manual User Manual Page 321

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