Chapter 12. REPAIR OF HYDRAULIC COMPONENTS

CHAPTER 12

REPAIR OF HYDRAULIC COMPONENTS

Tighten nut, leaving a clearance of 1/32 to 1/16 inch.

12-1. Hydraulic Hoist Cylinder

Make all hydraulic connections. Install lift chains so

a. Removal.

they share the load equally. Bleed air from cylinder by

(1) To remove hydraulic hoist cylinder (35, fig.

removing both bleeder screws, (1, fig. 12-2). When only

12-1) from within the uprights, remove nut (29) and

fluid appears at bleeder holes, replace screws.

washer (30) at top of inner upright. Disconnect hydraulic

c. Disassembly.

line and fittings at bottom of cylinder.

(1) Remove hoist cylinder.

(2) Slide inner upright to extreme upward position

(2) Remove screws (1, fig. 12-2) and washers (2).

and block securely with length of 4 by 4 inch wood.

Unscrew cylinder end (3). Remove packing (5) and

(3) Release chains from cylinder by removing

washer (4) from cylinder end.

anchor screws (19) and nuts (20 and 21). Slide

(3) Unscrew packing nut (6) from plunger (28).

crosshead upward, freeing end of cylinder. Hoist the

Remove wiper ring (7), packing retainer (8) and five

cylinder free of vehicle.

packings (9).

b. Installation.

(4) Unscrew packing nut (11) from cylinder (21).

(1) Place cylinder in position over adapter (36) in

Remove wiper ring (12), retainer (13) and five packings

base of uprights.

(14).

(2) Slide crosshead down over top of cylinder as

(5) Unscrew packing nut (16) from cylinder (22).

far as possible. Feed chains over rollers of crosshead,

Remove wiper ring (17), packing retainer (18) and five

and secure in place with screws and nuts.

packings (19).

(3) Remove wood block and carefully lower inner

(6) Unscrew and remove cylinder (21) from

upright, allowing it to slide in position over threaded end

cylinder (22) and remove bearing (15) from inside of

of cylinder. Install washer and nut on threaded end.

cylinder.

12-1