Skytrak 6042 Service Manual User Manual download pdf (Page 352)

Hydraulic System

8.120

Model 6042 Legacy Origin 7/02

f. Frame Sway Cylinder Installation

1. Lubricate the cylinder pins with multi-purpose,

lithium-based grease.

2. Use a sling and hoist or other suitable lifting device

to help install the cylinder. Orient the cylinder with

the cylinder eyelet on top and the rod eyelet on the

bottom.

3. Install the upper cylinder pin. Drive the lubricated

cylinder pin through the cylinder eyelet, frame mount

and self-aligning bearing. Secure the pin with a

capscrew and hex-locknut. Torque to 18 lb-ft (24 Nm).

4. Use new flat-faced, oiled o-rings when installing the

upper and lower hydraulic hoses. Install and tighten

the hoses onto the appropriate fittings.

5. With the help of an assistant, start the engine.

Carefully and slowly, operate the joystick frame sway

function to properly align the rod with the anchor

plate as required. Turn the engine OFF.

6. Install the lower cylinder pin. Drive the lubricated

cylinder pin through the rod eyelet, anchor plate and

self-aligning bearing. Secure the pin with a capscrew

and hex-locknut. Torque nut to 18 lb-ft (24 Nm).

7. Remove all tools, etc. from the vehicle. Carefully

remove the blocking supporting the vehicle frame at

the front and rear axles.

8. Start the engine and run at approximately one-third

to one-half throttle for about one minute without

moving the vehicle or operating any hydraulic

functions. Operate the joystick to fully sway the

frame left and right at least five times each.

9. Inspect for leaks and check the level of the hydraulic

fluid in the reservoir. Shut the engine OFF. Add

hydraulic fluid if required.

10. Wipe up any hydraulic fluid spillage in, on, near and

around the vehicle, work area and tools.

g. Frame Sway Cylinder Pressure Checking and

Circuit Bleeding

1. Attach a 4,000 psi (276 bar) gauge to the test fitting

on the “VG” port of the unloader valve to test the

system pressure. Pressure readings should be

3,000 ±100 psi (207 ±7 bar). Refer to Section 8.7,

“Hydraulic System Testing.” To check the cylinder

pressure, consult the factory.

2. Start with the frame sway and stabilizer cylinders

balanced, that is, with the frame level.

3. Sway the vehicle fully left. Hold the joystick at full

sway left for several seconds, then sway the vehicle

fully right and hold the joystick at full sway right for

several seconds. Observe the readings on the gauge

during the frame sway operations.

4. Level the frame. While leveling the frame, check the

pressure reading on the gauge.

5. Repeat Steps 3-4 five times.

WARNING: Avoid prolonged engine

operation in closed areas with inadequate

ventilation. Failure to properly ventilate exhaust

fumes can result in death or serious injury.

WARNING: Escaping hydraulic fluid

under pressure can penetrate the skin, causing

death or serious injury.

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Skytrak 6042 Service Manual User Manual Page 352

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