Skytrak 6042 Service Manual User Manual download pdf (Page 335)

8.103

Model 6042 Legacy Origin 7/02

Hydraulic System

f. Attachment Tilt Cylinder Installation

1. Attach a suitable sling to an overhead crane or other

suitable device and to the attachment tilt cylinder.

Make sure the device used can actually support the

cylinder. Place the attachment tilt cylinder in position

within the gooseneck. Refer to Section 3.3, “Boom

Assembly Maintenance.”

2. Install the lower attachment tilt cylinder pin by

tapping it through the bottom of the Quick Attach (if

installed). Install the retaining bolt.

3. Coat the attachment tilt cylinder base pin with anti-

seize compound and install the pin by tapping it in

through the top of the gooseneck.

4. Secure the attachment tilt cylinder base pin to the

boom with two 2" external retaining rings.

5. Install the lower pivot pin and Quick Attach as required.

6. Connect the attachment tilt cylinder hydraulic hoses

in relation to the labels or markings made during

removal.

7. 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.

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

fluid in the reservoir. Add hydraulic fluid to the

reservoir as needed. Shut the engine OFF.

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

around the vehicle, work area and tools.

10. Conduct a pressure check of the attachment tilt

cylinder hydraulic circuit and bleed the circuit as

outlined in the procedure that follows.

g. Attachment Tilt Cylinder Pressure Checking and

Circuit Bleeding

1. Attach a 4000 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 3000

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

“Hydraulic System Testing.” To check the cylinder

pressure, consult the factory.

2. With no accessory installed on the Quick Attach, start

with the lift/lower and attachment tilt cylinders fully

retracted.

3. Fully extend the attachment tilt cylinder. Hold the

attachment tilt joystick at full extend while fully

raising the lift/lower cylinder.

4. Fully retract the attachment tilt cylinder. Hold the

attachment tilt joystick at full retract while fully

retracting the lift/lower cylinder.

5. Repeat Steps 3-4 five times.

8.13.5 Slave Cylinders

Each slave cylinder (Fig. 8-68, 1) is secured to the

vehicle frame and outer boom with cylinder mount pins,

hex-head capscrews and nuts.

Figure 8-68 Slave Cylinders

a. Slave Cylinder Removal

1. Park the vehicle on a firm, level surface, fully retract

all hydraulic cylinders, then raise the boom to

approximately a 30-degree angle. Support the

boom. Place the travel select lever in (N) NEUTRAL,

place the neutral lock lever in the (N) NEUTRAL

LOCK position, engage the park brake switch and

shut the engine OFF.

2. Place an Accident Prevention Tag on both the

ignition key switch and the steering wheel, stating

that the vehicle should not be operated. Refer to

Section 1.5, “Accident Prevention Tag Usage.”

3. Unlock and open the rear door. Allow the hydraulic

fluid to cool.

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.

WARNING: Hot hydraulic fluid can

cause severe burns. Wait for hydraulic fluid to

cool before servicing any hydraulic component.

MA9290

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