Groundsmaster 4300--DHydraulic System Page 4 -- 60
Service and Repairs
General Precautions for Removing and Installing Hydraulic System Components
Before Repair or Replacement of Components
1. Before removing any parts from the hydraulic sys-
tem, park machine on a level surface, engage parking
brake, lower cutting decks and stop engine. Remove
key from the ignition switch.
2. Thoroughly clean machine before disconnecting, re-
moving or disassembling any hydraulic components.
Make sure hydraulic components, hose connections
andfittingsarethoroughlyc leaned. Always keep in mind
the need for cleanliness when working on hydraulic
components.
CAUTION
Before loosening any hydraulic component, op-
erate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil. SeeRelieving Hydraulic SystemPres-
sure in the General Information section of this
chapter.
3. Operateall hydrauliccontrols torelieve systempres-
sure before loosening any hydraulic connection (see
Relieving Hydraulic System Pressure in the General In-
formation section).
4. Putcaps orplugs onany hydraulic lines,hydraulic fit-
tings or components left open or exposed to prevent
contamination.
5. Before disconnecting hydraulic lines and hoses,
place labels to ensure proper installation after r epairs
are completed.
6. Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Mark parts if necessary to make sure that fittings will be
aligned properly when reinstalling hydraulic hoses and
tubes.
After Repair or Replacement of Components
1. If a component failure occurred in the closed loop
traction circuit (e.g. piston pump or wheel motor), filter-
ing the traction circuit is recommended (see Filtering
Closed--Loop Traction Circuit in this section).
2. If component failure is severe or hydraulic system is
contaminated, flush hydraulic system (see Flush Hy-
draulic System in this section).
3. Lubricate O--rings and seals w ith clean hydraulic oil
before installing hydraulic components.
4. Make sure all caps or plugs are removed from hy-
draulic tubes, hydraulic fittings and components before
reconnecting.
5. Use proper tightening methods when installing hy-
draulic hoses and fittings (see Hydraulic Fitting Installa-
tion in the General Information section of this chapter).
6. After repairs, check control linkages and cables for
proper adjustment, binding or broken parts.
7. After repairs are completed, clean hydraulic compo-
nents, hose connections and fittings to prevent future
accumulation of dirt and debris on hydraulic compo-
nents.
8. After disconnecting or replacing any hydraulic com-
ponents, operate machine functions slowly until air is
outofsystem (seeHydraulicSystemStartUpin this sec-
tion).
9. Check for hydraulic oil leaks. If any leaks are discov-
ered, shut off engine and correct leaks.
10.Check oil level in hydraulic reservoir and add correct
oil if necessary.
