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Groundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 113
Removal (Fig. 79)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply park ing brake and remove
key from the ignition switch.
2. Remove steering tower cover to allow access to
steering control valve.
3. Read the General Precautions for Removing and
Installing Hydraulic System Components at the begin-
ning of the Service and Repairs section of this chapter.
4. To prevent contamination of hydraulic system during
steering control valve removal, thoroughly clean exteri-
or of control valve and fittings.
NOTE: To ease installation, label the hydraulic lines to
show their correct position on the steeringc ontrol valve.
5. Remove hydraulic lines from steering control valve.
6. Remove steering control valve from machine using
Figure 79 as a guide.
7. If hydraulic fittings are to be removed from steering
control valve, mark fitting orientation to allow correct as-
sembly. Remove fittingsfrom valve and discard O--rings
(Figs. 80 and 8 1).
Installation (Fig. 79)
1. If fittings were removed from steering control v alve,
lubricate and place new O--rings onto fittings. Install fit-
tingsinto portopeningsusing marksmadeduring ther e-
movalprocess toproperly orientate fittings (Figs.80 and
81). Tighten fittings (see Hydraulic Fitting Installation in
the General Information section of this chapter).
2. Install steering control valve using Figure 79 as a
guide.
3. Using labels placed during steering control valve re-
moval, properly install hydraulic lines to control valve
(see Hydraulic Hose and Tube Installation in the Gener-
al Information section of this chapter).
4. Make sure hydraulic tank is full.
5. Properly fill hydraulic system (see Charge Hydraulic
System in this section).
6. Install steering tower cover to machine.
1. Steering control valve
2. 45
o
hydraulic fitting
3. Straight fitting (2 used)
4. 45
o
hydraulic fitting
5. Straight fitting
Figure 80
1
2
4
5
3
3
1. Steering control valve
2. O--ring
3. Straight fitting
4. Straight fitting
5. 45
o
fitting
6. 45
o
fitting
7. O--ring
8. O--ring
Figure 81
1
2
4
5
32
2
3
6
7
7
8
2
Hydraulic
System