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Pro SweepHydraulic System Page 3 -- 22
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, empty sweeper hopper and position sweeper on a
level surface. Chocksweeper wheels toprevent sweep-
er from moving. If sweeper is attached to tow vehicle,
apply tow vehicle parking brake, stop engine and re-
move key from the ignition switch.
2. Clean machine before disconnecting, removing or
disassembling any hydraulic components. Make sure
hydraulic components, hoses, c onnections and fittings
are thoroughly cleaned. Always keep in mind the need
for cleanliness when working on hydraulic equipment.
CAUTION
Before disconnecting any hydraulic compo -
nents, operate all sweeper hydraulic controls to
relieve system pressure and avoid injury from
pressurized hydraulic oil. See Relieving Hydrau-
lic System Pressure in the General Information
section of this chapter.
3. Put caps or plugs onanyhydraulic lines, hydraulic fit-
tings or hydraulic components left open or exposed to
prevent hydraulic system contamination.
4. Put labels on disconnected hydraulichoses for prop-
er installation after repairs are completed.
5. Note the position of hydraulic fittings (especially el-
bow fittings) on hydraulic components before removal.
Mark parts if necessary to makesuretheywill be aligned
properly when reinstalling hydraulic hoses.
After Repair or Replacement of Components
1. If component failure was severe or if hydraulic sys-
tem is contaminated, drain entire hydraulic system.
Drain and flush all hoses and components. Also, drain
and refill tow vehicle hydraulic system reservoir and
change oil filter.
2. Lubricate O--rings and seals with clean hydraulic oil
before installing hydraulic components.
3. Make sure caps or plugs are removed from the hy-
draulic lines, hydraulic fittings and components before
reconnecting.
4. Use proper tightening methods when installing hy-
draulic hoses and fittings (see Hydraulic Fitting Installa-
tion in the General Information section of this chapter).
5. After repairs are completed but before operating the
sweeper, check oil level in the hydraulic reservoir of the
tow vehicle and add correct oil if necessary.
6. After disconnecting or replacing any hydraulic com-
ponents, operate machine functions slowly until air is
out of system.
7. Check for hydraulic oil leaks. Shut off tow vehicle en-
gine and correct leaks if any are discovered. Check oil
level in hydraulic reservoir and add correct oil if neces-
sary.