Skytrak 6042 Service Manual User Manual download pdf (Page 339)

8.107

Model 6042 Legacy Origin 7/02

Hydraulic System

3. Use new oiled o-rings and reattach and secure the

hydraulic hoses to the slave cylinder fittings.

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

to one-half throttle for about one minute without

moving the vehicle or operating any hydraulic

functions.

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

fluid in the reservoir. Shut the engine OFF. Add

hydraulic fluid if required.

6. Conduct a pressure check of the attachment tilt/

slave cylinder hydraulic circuit and bleed the circuit

as outlined in the procedure that follows.

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

around the vehicle, work area and tools.

g. Slave 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. 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. Monitor

pressure while fully raising the lift/lower cylinder.

4. Fully retract the attachment tilt cylinder. Monitor

pressure while fully retracting the lift/lower cylinder.

5. Repeat Steps 3-4 five times.

8.13.6 Extend/Retract Cylinder

The extend/retract cylinder (Fig. 8-71, 1) is located under

the boom attached to the bottom of the outer boom and

the intermediate boom.

Figure 8-71 Extend/Retract Cylinder

a. Extend/Retract Cylinder Removal

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

retract all hydraulic cylinders. 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. Support the

boom in a horizontal and level position with blocking.

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.

4. Operate the hydraulic controls after the engine has

stopped, to relieve any trapped pressure.

5. Label or otherwise mark the hydraulic hoses in

relation to the extend/retract cylinder. Disconnect

and cap both hoses and the cylinder fittings. Refer to

Section 3.3, “Boom Assembly Maintenance.”

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.

WARNING: Escaping hydraulic fluid

under pressure can penetrate the skin, causing

death or serious injury. Relieve hydraulic pressure

before servicing any hydraulic component.

MH3690

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Skytrak 6042 Service Manual User Manual Page 339

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