Service Manual

Multi Pro 5800Hydraulic System Page 5 − 52
Removal (Fig. 42)
1. Park machine on a level surface, stop engine, en-
gage parking brake and remove key from the ignition
switch.
2. Remove the rear undercarriage shroud (see Under-
carriage Shrouds in Chapter 9 − Chassis in this manual).
3. To prevent contamination of hydraulic system during
gear pump removal, thoroughly clean exterior of pump
assembly.
CAUTION
Rotate steering wheel and depress traction ped-
al in both forward and reverse to relieve hydrau-
lic system pressure and to avoid injury from
pressurized hydraulic oil.
4. Operate all hydraulic controls to relieve hydraulic
system pressure.
5. Read the General Precautions for Removing and
Installing Hydraulic System Components at the begin-
ning of the Service and Repairs section of this chapter.
6. For assembly purposes, label hydraulic hoses to
show their correct position on the gear pump.
7. Put drain pan below the gear pump. Remove hydrau-
lic hoses connected to gear pump. Put plugs or caps on
disconnected hydraulic hoses and fittings to prevent
contamination of the system.
8. Support the gear pump to prevent it from falling. Re-
move two (2) cap screws and flat washers retaining gear
pump to piston pump.
9. Carefully pull gear pump from piston pump and lower
it out of the machine. Locate and retrieve O−ring (item 2)
from between pumps.
10.If hydraulic fittings are to be removed from gear
pump, mark fitting orientation to allow correct assembly.
Remove fittings from pump and discard O−rings.
Installation (Fig. 42)
1. If fittings were removed from gear pump, lubricate
and place new O−rings onto fittings. Install fittings into
pump port openings using marks made during the re-
moval process to properly orientate fittings. Tighten fit-
tings (see Hydraulic Fitting Installation in the General
Information section of this chapter).
2. Lubricate new O−ring (item 2) and position it to gear
pump.
3. Apply anti−seize lubricant to the gear pump shaft
splines and carefully raise gear pump and position it to
the piston pump.
4. Align spline teeth and slide gear pump input shaft
into piston pump coupling. Support gear pump to pre-
vent it from shifting. Secure gear pump to piston pump
with two (2) cap screws and flat washers.
5. Remove plugs or caps from disconnected hydraulic
hoses of the gear pump. Lubricate new O−rings and
install hoses to correct location on gear pump.
6. Charge the hydraulic system (see Charge Hydraulic
System in this chapter).
7. Install the rear undercarriage shroud (see Undercar-
riage Shrouds in Chapter 9 − Chassis in this manual).