SkyTrak 8042 Service Manual - Manual (Page 507)

Hydraulic System
8.92 Model 8042, 10042, 10054 Legacy Rev. 10/03
b. Secondary Function Manifold Disassembly,
Cleaning, Inspection and Assembly
1. Secure the secondary function manifold (1) in a
suitable bench vise, if possible.
2. Remove the 550 psi (38 bar) pressure reducing
valve (2).
3. Remove the 2500 psi (172 bar) pressure reducing
valve (3).
4. Remove the 650 psi (45 bar) pressure relief valve
(4).
5. Remove the solenoid nuts (5), coils (6) and
cartridges (7).
6. Remove the check valve (8).
7. Clean all components with a suitable cleaner before
inspection.
8. Inspect the solenoid cartridges for proper operation.
Check by shifting the spool to ensure that it is
functioning properly. Check that the spring is intact.
Inspect the cartridge interior for contamination.
9. Inspect internal passageways of the secondary
function manifold and its component parts for wear,
damage, etc. If inner surfaces of the secondary
function manifold DO NOT display an ultra-smooth,
polished finish, or components are damaged in any
way, replace the secondary function manifold or
appropriate part. Often, dirty hydraulic fluid causes
failure of internal seals and damage to the polished
surfaces within the secondary function manifold.
Note: 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.
10. Secure the secondary function manifold (1) in a
bench vise or by other suitable means.
11. Install the pressure reducing valve assembly (2) and
torque to 60-70 lb-ft (81-95 Nm).
12. Install the pressure reducing valve assembly (3) and
torque to 35-40 lb-ft (47-54 Nm).
13. Install the relief valve assembly (4) and torque to
25-30 lb-ft (34-41 Nm).
14. Install the check valve (8) and torque to 25-30 lb-ft
(34-41 Nm).
15. Install the solenoid cartridges (7) and torque to 25-30
lb-ft (34-41 Nm). Install the solenoid coils (6) and nuts
(5). Torque the nuts to 4-6 lb-ft (5-8 Nm).
MH3260
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