Terex TA30 Maintenance Manual page 251

15
17
18 14
1 - Capscrew
2 - End Cap
3 - 'O' Ring
4 - Gerotor Housing
5 - Spacer Plate
6 - Driveshaft
DESCRIPTION
Numbers in parentheses refer to Fig. 1.
The steering valve can be identified as item 4 in Section
220-0000, STEERING SYSTEM SCHEMATIC.
The steering valve, mounted off the underside of the
cab floor and connected to the steering column,
controls hydraulic flow in the steering system. The
steering valve is of a closed centre design, which
means that the valve does not have any flow through it
when it is in the neutral or no steering position. The
steering valve has integral cylinder relief valves which
relieve shock loads on the steering cylinders by
transferring excessive pressure applied to the oil by
SM 1986 Rev 1 11-00
12 11 10
20 13
7 - Valve Housing
8 - Sleeve
9 - Ball - Check
10 - Pin
11 - Centring Springs
12 - Needle Bearing
Fig. 1 - Sectional View of Steering Valve
STEERING SYSTEM - Steering Valve
8 16 7 6
9
13 - Bearing Race
14 - 'O' Ring
15 - Dust Seal
16 - Spool
17 - Seal
18 - Backup Ring
the road shock, to the opposite end of the cylinders.
This shock, if left unchecked, might damage steering
linkage components.
The main components of the steering valve are valve
housing (7), gerotor housing (4), gerotor gear (19),
driveshaft (6), sleeve (8) and spool (16).
There are five ports on valve housing (7) as follows:
Port 'P' - Supply from pump via priority valve
Port 'T' - Return to tank
Port 'R' - Cylinder supply for right hand turn
Port 'L' - Cylinder supply for left hand turn
Port 'LS' - Load Sensing
Section 220-0090
SM - 2016
5 4
1
19
2
3
19 - Gerotor Gear
20 - Retainer
21 - 'O' Ring
22 - 'O' Ring
23 - Roll Pin
24 - Ball valve
1
Courtesy of Machine.Market