Makeup Valves.

(2) Removal.

d. Makeup Valves.

(1) General. Makeup valves are provided to

(a) Remove the hydraulic tank from tractor

supply tank oil (directly to the bulldozer cylinder

and remove the tank assembly from bottom plate

lines whenever the line pressure, is less than tank

pressure. This occurs when the bulldozer blade

(b) Remove bolts (4. fig. 4-8) and remove

raises or lowers rapidly. The valves are located in a

makeup valve body (3).

common valve body bolted to the bulldozer control

(c) Remove bolts (1) and (6) and remove

covers (2) and (5).

valve. A spring holds each valve seated during

normal operation. When oil pressure in the

(d) Remove springs (3, fig. 4-9) and valves

bulldozer circuit is reduced, oil in the tank over-

(4).

comes the spring, opens a valve and flows into the

bulldozer circuit.

4-12