Section 230-0121
SM 1599 12-98
1
BODY SYSTEM - Pilot Supply Valve
Fig 1. - Pilot Supply Valve Installation
1 - Valve Body
2 - Accumulator
3 - Mounting Bracket
4 - Plug
SM - 1799
DESCRIPTION
The pilot supply valve can be identified as item 14 in
Section 230-0000, BODY SYSTEM SCHEMATIC.
Mounted off the accumulator mounting bracket on the
right hand platform, the pilot supply valve is located in
the hydraulic lines between the steering pump and the
body control joystick. See Fig. 2 for schematic symbol.
Intregal of the pilot supply valve is a restriction valve
which steps down the supply pressure of 159 bar
(2 300 lbf/in²) from the steering pump to between
30 bar (435 lbf/in²) and 35 bar (500 lbf/in²). The pilot
supply valve is fitted with an accumulator, pre-charged
with nitrogen, to a pressure of 13 bar (188 lbf/in²).
Fig. 2 - Pilot Supply Valve Schematic Symbol
SM - 1800
5 - Seal
6 - Bolt
7 - Lockwasher
8 - Washer
9 - Elbow - 90°
10 - Tee Piece
11 - Diagnostic Fitting
12 - Cap
13 - Elbow - 45°
PV
T
P2
11
12
13
2
1
3
4,5
6,7,8
10
9
TO MANIFOLD
BRACKET IN
CAB FLOOR
TO STEERING
TANK
TO MANIFOLD
BRAKE VALVE
P1 P2
T
PV
35 bar (500 lbf/in²)
standard
30 bar (435 lbf/in²)
standard
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