Lull 944E-42 Service Manual - Manual (Page 442)

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).
T
CT
A
P
CTB
HB
HA EB
EA AUX2
AUX1 TB
TA
CTA
TR
CTB
HO
EXT
AX
T1
MU5650
1
2
3
5
3
4
T
CT
A
P
CTB
HB
HA EB
EA AUX2
AUX1 TB
TA
CTA
TR
CTB
HO
EXT
AX
T1
MU5650
6
7
8
11
9
5
10
8
MU5640
12
13
14