7.
connect to gear pump and piston pump.
Forinstallationpurposes,labelallhydrauliclinesthat
6. Remove plugs or caps from disconnected hydraulic
hoses and open ports of the pump assembly. Using la-
bels placed during pump removal, install hydraulic fit-
tings and lines to correct location on gear and piston
pumps (see Hydraulic Fitting Installation and Hydraulic
Hose and Tube Installation in the General Information
section of this chapter).
8.
Put a drain pan below the pump assembly. Remove
hydraulic hoses and fittings connected to piston and
gear pumps. Putplugs orcaps on disconnected hydrau-
lic hoses to prevent contamination of the system. Put
plugs in open ports of pumps.
7.
Lower machine to ground.
NOTE: If fuel tank is removed from the machine, the
gear pump and piston pump can be removed as a com-
plete assembly.
8. Install new filter and fill hydraulic reservoir with cor-
rect oil.
9.
Removal in this section).
Remove gear pump from machine (see Gear Pump
9. Disconnect engine run solenoid electrical connector
to prevent engine from starting. Prime the hydraulic
pumps by turning the ignition key switch to start and
crank the engine for ten (10) seconds. Wait fifteen (15)
seconds to allow the starter motor to cool and then re-
peat cranking procedure again.
10.Support
the piston (traction) pump to prevent it from
falling while removing two (2) cap screws and washers
retaining pump assembly to engine flywheel plate.
Carefully pull pump assembly from flywheel plate and
lower it from the machine.
10.Connect engine run solenoid electrical connector,
start the engine and check for proper operation.
Installation (Fig. 62)
11.
System in this section).
Properly fill hydraulic system (see Charge Hydraulic
IMPORTANT: To prevent spring coupler damage,
make sure that piston pump is properly supported
anddoesnotputsideloadintocouplerduringpump
installation.
12.Stop engine and check for hydraulic oil leaks. Check
hydraulic reservoir oil level.
1.
Carefully raise piston pump into the machine, align
pump input shaft to spring coupler on engine and posi-
tion it to the engine flywheel plate. Support pump to pre-
vent it from producing any side load into coupler and
also to align pilot diameter of pump to flywheel plate
bore.
8
3
1
5
2
6
2.
Apply Loctite #242 (or equivalent) to threads of cap
screws (item 6).While maintaining pump alignmentwith
spring coupler and flywheel plate, install two (2) cap
screws and washers to secure piston pump to engine
flywheel plate. Torque screws from 79 to 84 ft--lb (108
to 113 N--m).
4
7
3.
Install gear pump to piston pump (see Gear Pump
Installation).
Figure 63
4.
Secure traction rod to control arm on piston pump by
installing cap screw, spacer and lock nut (Fig. 63).
1.
2.
3.
4.
Piston pump
Cap screw
Pump control arm
Spacer
5.
6.
7.
8.
Lock nut
Jam nut
Traction rod
Rod end
5.
Connect wire harness connector toneutral switch on
traction pump.
Groundsmaster 4100--D/4110--D
Page 4 -- 89
Hydraulic System
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