Terex TS14G, Maintenance Manual

Page: 187 / 376

Section 220-0090
SM 1765 2-99
1
SM - 2149
STEERING SYSTEM - Steering Valve
Fig. 1 - Exploded View of Steering Valve
DESCRIPTION
Numbers in parentheses refer to Figs. 1 & 2.
The steering valve consists of spool (47), lock plunger
(18) with poppets (17), cross-over relief valve
assemblies (4) and main relief valve assembly
(20 thru 36). Shifting spool (47) allows oil to flow to
one steering cylinder to extend it while allowing oil to
return to the hydraulic oil tank from the opposite
cylinder which is contracting. Cross-over relief valve
assemblies (4) allow steering cylinders to compensate
for road shocks and main relief valve assembly
(20 thru 36) relieves oil pressure in excess of
134 bar (1 950 Ibf/in
2 ) in the steering valve.
NEUTRAL POSITION
Numbers in parentheses refer to Fig. 2.
Oil enters the steering valve at the inlet port, flows
through spool (47) bore and back out of the valve
through return-to-tank passages and the return-to-tank
port. Oil pressure in the valve is not enough to cause
poppets (17) to shift, therefore, ports ‘A’ and ‘B’ remain
closed.
29 - 'O' Ring
30 - Spring
31 - Check
32 - Seat
33 - Check
34 - Spring
35 - 'O' Ring
36 - Cap
37 - Shims
38 - Nut
39 - Washer
40 - Washer
41 - Spacer
42 - Spring 15 - Spring
16 - Lockwasher
17 - Poppet
18 - Lock Plunger
19 - Cap
20 - Nut
21 - Jam Nut
22 - Washer
23 - Screw
24 - Cap
25 - 'O' Ring
26 - Spring
27 - Poppet
28 - Seat 1 - Seat
2 - 'O' Ring
3 - 'O' Ring
4 - Cross-over Relief Valve
5 - Spring
6 - Valve Body
7 - 'O' Ring
8 - Plug
9 - Cover
10 - Cap
11 - 'O' Ring
12 - Retaining Ring
13 - 'O' Ring
14 - Plug
43 - Plate
44 - Shims
45 - Washer
46 - Seal
47 - Spool
48 - Wiper
49 - Plate
50 - Lockwasher
51 - Bolt
52 - Plug
53 - Capscrew
*54 - Poppet
* - Shown on Fig. 2
Courtesy of Machine.Market