Lull 944E-42 Service Manual User Manual download pdf (Page 465)

100

101

8.213

Model 644E-42/944E-42 Rev. 6/04

Hydraulic System

4. ALWAYS use new oiled o-rings, seals, gaskets, etc.

DO NOT over-stretch seals, wipers and o-rings. After

installing such parts, verify that they are not twisted

in their grooves.

5. To aid in installation, lubricate piston seals and the

seal installation path with clean, filtered hydraulic oil.

6. Lubricate the outer surfaces of the seals and o-rings

and the inside of the tube, piston and head gland

with clean, filtered hydraulic oil. Use a suitable

installation or compression tool when installing the

piston and head gland into the cylinder to help

prevent twisting or damaging the seals and o-rings.

When sliding the rod and piston assembly in the

tube, DO NOT damage the piston by scraping it

against the threads in the tube. Keep the rod in line

with the tube to prevent binding.

7. Follow the manufacturer’s instructions when

applying primer, locking or retaining compounds that

are specified in the cylinder assembly procedures.

The use of primer is recommended in some cases to

decrease cure time. Allow sealant to cure fully before

proceeding with the assembly procedure. The curing

process may be hastened by the use of a heat gun

to blow warm, dry air on the parts.

8. After assembling a cylinder, test the cylinder at low

operating pressures. Verify that the piston and rod

move freely in both directions.

9. Increase the operating pressure to the maximum

pressure recommended for the cylinder. Check for

external leakage and for free movement in both

directions.

10. Retract the piston fully. Cap the hydraulic fittings.

8.14.4 Attachment Tilt Cylinder

The attachment tilt cylinder (9) is attached at the front of

the inner boom inside the gooseneck (10).

a. Attachment Tilt Cylinder Removal

1. Remove any attachment from the vehicle. Park the

vehicle on a firm, level surface, fully retract all

hydraulic cylinders. Allow sufficient work space at

the front of the boom. Raise the boom enough to

allow the quick attach or the bottom of the

gooseneck to clear the ground. Place the travel

select lever in the [N] NEUTRAL DETENT position,

engage the park brake switch and shut the engine

OFF.

2. Place an Accident Prevention Tag on both the

ignition switch and the steering wheel, stating that

the vehicle should not be operated. Refer to Section

1.5, “Accident Prevention Tag Usage.”

3. Unlatch and open the engine cover. Allow the

hydraulic fluid to cool.

4. Label or otherwise mark the hydraulic hoses in

relation to the attachment tilt cylinder. Disconnect

and cap both hoses and attachment tilt cylinder

fittings. Refer to Section 3.6.5, “Attachment Tilt

Cylinder Removal.”

5. Remove the attachment tilt cylinder from the vehicle.

6. Wipe up any hydraulic fluid spillage in, on, near or

around the vehicle.

MU3510

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.

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