Skytrak 6042 Service Manual User Manual download pdf (Page 318)

100

101

Hydraulic System

8.86

Model 6042 Legacy Origin 7/02

b. Secondary Function Manifold Disassembly,

Cleaning, Inspection and Assembly

1. Secure the secondary function manifold (Fig. 8-50, 1)

in a suitable bench vise if possible.

Figure 8-50 The Secondary Function

Manifold Components

2. Remove the 2,500 psi (172 bar) pressure-reducing

valve (Fig. 8-50, 2).

3. Remove the 550 psi (38 bar) pressure-reducing

valve (Fig. 8-50, 3).

4. Remove the 650 psi (45 bar) pressure-relief valve

(Fig. 8-50, 4).

5. Remove the solenoid nuts (Fig. 8-50, 5), coils (6)

and cartridges (7).

6. Remove the check valve (Fig. 8-50, 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 (Fig. 8-50, 1)

in a bench vise or by other suitable means.

11. Install the pressure-reducing valve assembly

(Fig. 8-50, 2) and torque to 60-70 lb-ft (81-95 Nm).

12. Install the pressure-reducing valve assembly

(Fig. 8-50, 3) and torque to 35-40 lb-ft (47-54 Nm).

13. Install the relief valve assembly (Fig. 8-50, 4) and

torque to 25-30 lb-ft (34-41 Nm).

14. Install the check valve (Fig. 8-50, 8).

15. Install the solenoid cartridges (Fig. 8-50, 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).

MT2900

Torque to

25-30 lb-ft

(34-41 Nm)

Torque to

35-40 lb-ft

(47-54 Nm)

Torque to

60-70 lb-ft

(81-95 Nm)

Torque to

25-30 lb-ft

(34-41 Nm)

Torque to

25-30 lb-ft

(34-41 Nm)

Torque to

4-6 lb-ft

(5-8 Nm)

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