8

drive to each pair of wheels. A full locking type differential is available as an optional feature. The differential axle shafts are mounted in double tapered bearings on the outboard ends, and are lubricated by the differential gear oil. A sprocket is bolted to each axle shaft and extends into the chain drive housing. The differential and axle shafts are rigidly mounted, while the chain cases are free to move from side to side and the opening betwegn axle shaft and chain case is closed with a flexible boot.

At the rear of the right and left hand chain case, an axle shaft is installed in tapered bearings protruding from both sides of each case to accomodate the keyed hubs, wheels, brakes, etc. The bearings are internal and lubricated by the chain lubricant. With the hub, axle, wheels, etc. rigid in relation to the chain case and the case free to pivot on each end, wheel oscillation is possible. On the back end of each chain case is a large adjusting bolt and lock nut. Turning the bolt to the right or clockwise direction pulls the entire chain case, wheels, etc. toward the rear of the machine with resultant tightening of the drive chain. The drive chains should be kept tight, free from slack, at all times. Inspection of the chain may be made by removing the cover plate on top of the chain case.

FRONT AXLE

The Rexpac is equipped with five front wheels, the center being a single, and the outer in pairs. Each axle for the pairs of wheels, is center pivoted for wheel oscillation, and all wheels are connected to an upper "walking beam" by means of struts for further oscillation. The walking beam pivots on two center pins. Front wheel hubs rotate on tapered bearings that should be repacked every 1,000 running hours. When bearings are reinstated, they should be adjusted to 0 preload. Lubricate all fittings weekly. F HNM

STEERING CYLINDER, HYDRAULIC The hydraulic steering cylinder is double acting and operates with a working pressure of approximately 300600 PSI. A periodic check should be made for tight hose connections at the cylinder. Each end of the cylinder is secured to a non-adjustable base. No adjustment in length is required. The base and rod end of the cylinder are fitted with a ball and socket type bearing so that the cylinder pivots with the turn of the wheels.

In the event the cylinder is in need of repair, a repair kit is available from the factory. Disassembly of the cylinder is as follows: (Fig. 4)

1. Be sure the cylinder is not under pressure before removing cylinder.

2. Disconnect the two hydraulic hoses from the cylinder. Flush hoses after removing. Remove

bolts at base and tod end of cylinder which

holds cylinder in place and remove cylinder. 3. The cylinder may be held in a vise, gripped lightly, at the base end.

4. Remove snap ring(A), pull piston and rod assembly (B) out against the cylinder head (C) by

tapping against shoulder of rod base (D), this

will free the cylinder head (C) from cylinder (E).

5. Remove nut (F) from shaft (G). The piston (H)

and cylinder head (C) may now be 'slid off shaft (G). Seal (J) may be pryed out from cylinder head. Remove "0" rings (K), (L), (M), (N) and leather ring (P).

6. Clean all parts in solvent or kerosene and 'soak new "0" rings, seal and leather ring in hydraulic oil before reassembly. Inspect shaft and piston, if scored, they 'should be replaced. 7. Press new seal (J) into cylinder head (C) with

lip of seal facing the outside. Install "0" ring

(K), leather seal (P) and "0" ring (L). Slide

G

C KPL A,/ D

cylinder head on shaft being careful not to damage the seal lip and leather seal (P).

. Install "0" rings (M) and (N) on piston and reassemble piston on shaft securing with nut (E).

9. Slide piston and rod assembly into cylinder. It may be necessary to tap the cylinder head in place to bottom on shoulder in cylinder. Replace snap ring (A).

10. Reinstall cylinder on machine. Add clean hydraulic oil to reservoir to oil level.