Removal (Fig. 95)
Park machine on a level surface, lower cutting
4
1.
decks, stop engine, apply parking brake and remove
key from the ignition switch.
5
2.
Installing Hydraulic System Components at the begin-
ning of the Service and Repairs section of this chapter.
Read the General Precautions for Removing and
3.
Remove steering tower cover (item 1).
4.
steering valve removal, thoroughly clean exterior of
steering valve, hydraulic tubes and fittings.
To prevent contamination of hydraulic system during
1
3
5.
valve. Put caps or plugs on fittings and tubes to prevent
contamination. Tag hydraulic lines for proper assembly.
Disconnect hydraulic tubes from steering control
2
Figure 96
6.
ling.
Support steering control valve to prevent it from fal-
1.
2.
3.
In port (P)
4.
5.
Out port (T)
Left turn port (L)
Right turn port (R)
Load sensing port (LS)
7.
Remove four (4) cap screws that secure steering
control valve to machine. Slide steering control valve
from lower end of steering shaft and remove from ma-
chine.
8.
If necessary, remove fittings from control valve and
discard fitting O--rings.
Installation (Fig. 95)
1.
If fittings were removed from steering control valve,
lubricate and place new O--rings onto fittings. Install fit-
tingsintocontrolvalveandtightenfittings(seeHydraulic
Fitting Installation in the General Information section of
this chapter).
2.
Slide steering control valve onto lower end of steer-
ing shaft. Secure control valve to machine with four (4)
cap screws. Torque screws from 34 to 42 ft--lb(47 to 56
N--m).
3.
Remove caps or plugs placed during removal to pre-
vent contamination.
4.
Connect hydraulic tubes to fittings on steering valve
using tags placed during control valve removal to identi-
fycorrecttubeplacement(seeHydraulicHoseandTube
Installation in the General Information section of this
chapter).
5.
6.
Install steering tower cover (item 1).
Fill reservoir with new hydraulic fluid as required.
Groundsmaster 5900/5910
Page 4 -- 131
Hydraulic System
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