Service manual

Hydraulic System
9-85
c. Shuttle Valve Installation
1. Attach the shuttle valve (Fig. 9– 61) to the brake valve
(Fig. 9– 62) with a 90° elbow fitting. The shuttle valve
(Fig. 9– 61) joins the steering valve shuttle fluid input
line (port P1, Fig. 9– 61), shuttle-in line from the main
control valve (port P2), and the brake valve load-
sense line (port P3). Use new O-rings as required.
Reattach and secure all hoses, clamps, etc.
2. Check the routing of all hoses, wiring and tubing for
sharp bends or interference with any rotating
members, and install tie wraps and/or protective
conduit as required. Tighten all tube and hose
clamps.
3. Start the engine and run at approximately 1/3 to 1/2
throttle for about one minute without moving the
vehicle or operating any hydraulic functions.
4. Inspect for leaks and check the level of the hydraulic
fluid in the reservoir. Shut the engine OFF.
Note: Check for leaks and repair as required before con-
tinuing. Add hydraulic fluid to the reservoir as needed.
5. Conduct a pressure check of the service brake and
steering hydraulic circuits.
6. Wipe up any hydraulic fluid spillage in, on, near and
around the vehicle, work area and tools.
Figure 9– 62. Service brake valve and shuttle valve detail.
9.9.9 Service Brake Valve
The service brake valve (Fig. 9– 58 and Fig. 9– 63) is
secured with four capscrews and lockwashers at the
base of the steering column support, concealed by the
lower dash cover.
The service brakes themselves are part of the axles (the
park brake is part of the front axle only). Refer to
Section
5 Axles, Wheels and Tires
for further information.
Service Brake Valve Replacement
Refer to
Section 4 Cab, Covers and Mirrors
for informa-
tion on replacing the service brake valve.
DO NOT disassemble the service brake valve. The ser-
vice brake valve is not serviceable and must be replaced
in its entirety if defective as no replacement parts are
available for internal components.
Figure 9– 63. Service brake valve.
WARNING: Avoid prolonged engine operation
in closed areas with inadequate ventilation.
Failure to properly ventilate exhaust fumes can
result in death or severe personal injury.
MS2510
Shuttle
Valve
To Rear
Brakes
To Front
Brakes
Diagnostic
Nipple
From Main
Control Valve
MS2090
Model 3606 • Origin 10/99