Operation and maintenance manual

Section 220-0090
SM 1391 5-98
1
STEERING SYSTEM - Steering Valve
SM - 534
1 - Seal Ring
2 - Valve Housing
3 - Check Valve Ball
4- Bushing
5 - 'O' Ring
6 - Kin Ring
7 - Bearing Assembly
8- Ring
9 - Spool
10 - Cross Pin
11 - Sleeve
12 - Neutral Position Spring
13 - Driveshaft
14 - Spacer
15 - 'O' Ring
16 - Distributor Plate
17 - Gear Wheel
18 - Gear Rim
19 - 'O' Ring
20 - End Cover
21 - Washer
22 - Roll Pin
23 - Bolt
24 - Bolt
Fig. 1 - Sectional View of Steering Valve
DESCRIPTION
Numbers in parentheses refer to Fig. 1. Letters in
parentheses refer to Fig. 3.
The Steering Valve can be identified as item 7 in Section
220-0000, STEERING SYSTEM SCHEMATIC.
The steering valve is connected to the steering column
and controls hydraulic flow in the steering system. A
pressure relief line in the neutral position, between
steering cylinder ports 'L' & 'R' and tank return port 'T',
means that the steering valve must only be used with
a flow amplifier valve. Refer to Section 220-0100,
FLOW AMPLIFIER VALVE.
The steering valve consists of valve housing (2),
bearing assembly (7), spool (9), sleeve (11), driveshaft
(13), gear wheel (17) and gear rim (18).
OPERATION
Refer to Fig. 3 for port identification.
There are five ports on the steering valve:
Port 'P' - Inlet from flow amplifier valve
Port 'T' - Return to tank
Port 'L' - Supply to LH steering circuit
Port 'R' - Supply to RH steering circuit
Port 'LS' - Load sensing line to flow amplifier valve
For operation of the steering valve refer to Section
220-0100, FLOW AMPLIFIER VALVE.