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Groundsmaster 5900/5910 Hydraulic SystemPage 4 -- 121
Removal (Fig. 88)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. Read the General Precautions for Removing and
Installing Hydraulic System Components at the begin-
ning of the Service and Repairs section of this chapter.
3. To preventcontamination ofhydraulic system during
lift cylinder removal, thoroughly clean exterior of cylin-
der and fittings.
IMPORTANT: Make sure to relieve lift system pres-
sure before removinglift cylinder. See Relieving Hy-
draulic System Pressure in the General Information
section of this chapter.
NOTE: To ease assembly, label all hydraulic hoses to
identify their correct position on the lift cylinder.
4. Disconnect hydraulic hoses from lift cylinder fittings.
Put caps or plugs on fittings and hoses to prevent con-
tamination. Tag hydraulic lines for proper assembly.
5. Remove cap screw (item 6) and flange nut (item 4)
that secure the pin (item 5) to the lift arm. Remove pin
from lift arm and cylinder shaft clevis which will free lift
cylinder from lift arm.
6. Remove two (2) jam nuts (item 11) from one end of
the pin (item 2). Pull pin from frame and cylinder barrel
clevis.
7. Remove lift cylinder from machine.
8. If hydraulic fittings are to be removed from lift cylin-
der, mark fitting orientation to allow correct assembly.
Remove fittings from cylinder and discard O--rings.
Installation (Fig. 88)
1. If fittings were removed from lift cylinder, lubricate
and place new O--rings onto fittings. Install fittings into
cylinder ports using marks made during the removal
process to properly orientate fittings. Tighten fittings
(see Hydraulic Fitting Installation in the General Infor-
mation section of this chapter).
2. Make sure that two (2) jam nuts (item 11) are
installed on one end of pin (item 2). Hold inner jam nut
with wrench andtorque outer jamnut from 60to 70 ft--lb
(82to94N--m).
3. Position cylinder barrel clevis to frame.
4. Insert pin (item 2) through frame and cylinder clevis.
Secure lift pin with two(2) jam nuts (item 11). Hand tight-
en first jam nut to take up as much free play as possible.
While holding first jam nut with wrench, torque second
jam nut from 60 to 70 ft--lb (82 to 94 N--m).
5. Insert pin (item 5) through lift arm and cylinder shaft
clevis. Secure pin to lift arm with cap screw (item 6) and
flange nut (item 4).
6. Remove caps or plugs placed during removal to pre-
vent contamination.
7. Using tags placed during cylinder removal, correctly
attach hydraulic hoses to lift cylinder (see Hydraulic
Hose and Tube Installation in the General Information
section of this chapter).
8. Fill reservoir with new hydraulic fluid as required.
9. Lubricate lift cylinder grease fittings.
10.After assembly is completed, operate lift cylinder to
verify that hydraulic hoses and fittings are not contacted
by anything.
Hydraulic
System