Groundsmaster 4100--D/4110--D Hydraulic SystemPage 4 -- 89
7. Forinstallationpurposes,labelallhydrauliclinesthat
connect to gear pump and piston pump.
8. Put a drain pan below the pump assembly. Remove
hydraulic hoses and fittings connected to piston and
gearpumps.Putplugsorcapsondisconnectedhydrau-
lic hoses to prevent contamination of the system. Put
plugs in open ports of pumps.
NOTE: If fuel tank is removed from the machine, the
gear pump and piston pump can be removed as a com-
plete assembly.
9. Remove gear pump from machine (see Gear Pump
Removal in this section).
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.
Installation (Fig. 62)
IMPORTANT: To prevent spring coupler damage,
make sure that piston pump is properly supported
anddoesnotputsideloadintocouplerduringpump
installation.
1. Carefully raise piston pump into the machine, align
pump input shaft to spring coupler on engine and posi-
tionitto theengineflywheelplate.Supportpumptopre-
vent it from producing any side load into coupler and
also to align pilot diameter of pump to flywheel plate
bore.
2. Apply Loctite #242 (or equivalent) to threads of cap
screws(item6).Whilemaintainingpumpalignmentwith
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).
3. Install gear pump to piston pump (see Gear Pump
Installation).
4. Secure tractionrodtocontrolarmonpistonpumpby
installing cap screw, spacer and lock nut (Fig. 63).
5. Connectwireharnessc onnectortoneutralswitchon
traction pump.
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).
7. Lower machine to ground.
8. Install new filter and fill hydraulic reservoir with c or-
rect oil.
9. Disconnect engine runsolenoid electricalconnector
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.Connect engine run solenoid electrical connector,
start the engine and check for proper operation.
11.Properly fill hydraulic system(seeChargeHydraulic
System in this section).
12.Stopengineandcheck forhydraulicoilleaks.Check
hydraulic reservoir oil level.
1. Piston pump
2. Cap screw
3. Pump control arm
4. Spacer
5. Lock nut
6. Jam nut
7. Traction rod
8. Rod end
Figure 63
1
2
4
5
6
3
7
8
Hydraulic
System
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