Skytrak 6042 Service Manual User Manual download pdf (Page 332)

Hydraulic System

8.100

Model 6042 Legacy Origin 7/02

Figure 8-66 Attachment Tilt Cylinder Components

b. Attachment Tilt Cylinder Disassembly

Note: An additional o-ring may be included at the base

of the cylinder rod. This additional o-ring may be discarded,

as it served only in a temporarily protective role.

1. Clean the attachment tilt cylinder (Fig. 8-66, 1) with

a suitable cleaner before inspection. Remove all dirt,

debris and grease from the cylinder.

IMPORTANT: Avoid using excess force when clamping

the cylinder in a vise. Apply only enough force to hold the

cylinder securely. Excessive force can damage the

cylinder tube (Fig. 8-66, 2).

2. If necessary, remove the grease fitting (Fig. 8-66, 3)

from the end of the rod (4).

3. Clamp the trunnion end of the attachment tilt

cylinder in a soft-jawed vise or in another acceptable

holding equipment if possible.

4. Slowly remove the 3000 psi (207 bar) counterbalance

valve (Fig. 8-66, 5) and the pilot-operated check

valve (6) from the attachment tilt cylinder.

5. Extend the rod (Fig. 8-66, 4) to allow access to the

base of the cylinder.

IMPORTANT: Protect the finish on the rod at all times.

Damage to the surface of the rod can cause seal failure.

6. Using a pin spanner wrench, unscrew the head

gland (Fig. 8-66, 7) from the tube (2). The head

gland was originally torqued to 300-400 lb/ft

(407-542 Nm), so a considerable amount of force is

required to remove it. Carefully slide the head gland

down along the rod toward the eyelet end, away from

the cylinder tube.

IMPORTANT: When sliding the rod and piston assembly

in the tube, prevent the threaded end of the tube from

damaging the piston (Fig. 8-66, 8). Keep the rod

centered within the tube to help prevent binding.

7. Carefully pull the rod (Fig. 8-66, 4) along with the

head gland (7) and all attachments straight out of the

tube (2).

8. Fasten the rod end in a soft-jawed vise and put a

padded support below and near the threaded end of

the rod to help prevent damage to the rod.

MA7100

Torque to

300-400 lb/ft

(407-542 Nm)

Apply Loctite #243 to

threads and torque to

200-300 lb/ft

(271-407 Nm)

Torque to

30-35 lb/ft

(41-47 Nm)

Apply Loctite #243 to

threads and torque to

155-175 lb/in

(18-20 Nm)

WARNING: Significant pressure may be

trapped inside the cylinder. Exercise caution when

removing a counterbalance valve or a pilot-

operated check valve from a cylinder. Escaping

hydraulic fluid under pressure can penetrate

the skin, causing death or serious injury.

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