Lull 944E-42 Service Manual User Manual download pdf (Page 442)

100

101

Hydraulic System

8.190

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

b. Single Joystick Pilot Select Valve Disassembly,

Inspection and Reassembly

Note: Use new oiled o-rings as required. ALWAYS

replace seals, o-rings, gaskets, etc., with new parts to

help ensure proper sealing and operation. Lubricate

seals and o-rings with clean hydraulic oil.

Note: Torque all the fittings as specified in Section 2.3,

“Torques.”

1. Remove the elbow fittings (1) from the “P” and “T1”

ports on one side of the block (2).

2. Remove the straight fittings (3) from the “1,” “2,” “3,”

“4” and “T” ports on both ends of the block.

3. Remove the six solenoid cartridges (4) and the

pressure reducing cartridge (5) from the block.

4. Clean all components with a suitable cleaner before

inspection.

5. Inspect internal passageways of the single joystick

pilot select valve and its component parts for wear,

damage, etc. If inner surfaces of the single joystick

pilot select valve DO NOT display an ultra-smooth,

polished finish, or components are damaged in any

way, replace the single joystick pilot select valve or

appropriate part. Often, dirty hydraulic fluid causes

failure of internal seals and damage to the polished

surfaces within the single joystick pilot select valve.

6. Secure the single joystick pilot select valve block (2)

in a bench vise or by other suitable means.

7. Install the elbow fittings into the “P” (6) and “T1” (7)

ports on one side of the block (2). Torque the “P” (6)

port, 25 lb-ft (33 Nm) and torque the “T1” (7) port, 15

lb-ft (20 Nm).

8. Install the straight fittings (8) into the “T,” “1,” “2,” “3,”

and “4” ports on both ends of the block. Torque the

straight fittings, 15 lb-ft (20 Nm).

9. Install four solenoid cartridges (9) into the block.

Torque the cartridges to 20 lb-ft (27 Nm). Torque the

solenoid nuts to 5 lb-ft (7 Nm).

10. Install the other two solenoid cartridges (10) into the

block and secure with two capscrews (11) each.

Torque the capscrews to 2.5 lb-ft (3 Nm).

11. Install the pressure reducing cartridge (5) into the

block. Torque the cartridge to 25 lb-ft (33 Nm).

c. Single Joystick Pilot Select Valve Installation

1. Position the single joystick pilot select valve (12)

back onto the valve plate (13).

2. Insert the two capscrews (14) through the single

joystick pilot select valve (12) and secure to the

valve plate. Torque the two capscrews to 5-9 lb-ft

(7-12,5 Nm).

CTA

CTB

AUX2

AUX1

CTA

CTB

EXT

MU5650

CTA

CTB

AUX2

AUX1

CTA

CTB

EXT

MU5650

MU5640

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