Greensmaster 3150Hydraulic System Page 4 -- 62
11.Remove two (2) cap screws (item 17), lock washers
(item16)and flatwashers(item 3)thatsecurepumpas-
sembly to pump adapter mounted to engine. Separate
pump assembly from the pump adapter and remove
from machine.
12.If necessary, remove pump hub (item 1) from pump
input shaft. Locate and retrieve key (item 39).
13.Separategearpumpfromthepistonpump(seeGear
Pump in this section).
IMPORTANT: If fittings are going to be removed
from piston pump, note position of fittings for as-
sembly purposes.
14.If fitting removal from piston pump is necessary,
markhydraulicfittingorientationtoallowcorrectassem-
bly. Remove hydraulic fittings and O--r ings from piston
pump. Discard removed O--rings.
15.If necessary, remove the neutral assembly attached
to the piston pump (see Piston(Traction) Pump Neutral
Assembly in this section).
Piston Pump Installation (Fig. 42)
1. If any neutral assembly components were removed
from piston pump, install them to pump (see Piston
(Traction) Pump Neutral Assembly in this section).
2. Make surethe flangesurfaces ofthegearpumpand
piston pump are thoroughly clean.
IMPORTANT: A case drainexists in thepiston (trac-
tion) pump and asuction port i s nearthe input shaft
of the gear pump (Fig. 45). Before the gear pump is
installed to the piston pump, make sure that plugs
placed in either of these ports are removed. Failure
to remove plugs will cause excessive pressure in
the piston pump and damage seals.
3. Install gear pump to the piston pump (see Gear
Pump in this section).
4. Ifremoved,securehub(item1)topistonpumpshaft:
A. Make sure that pump shaft and bore of hub are
thoroughly cleaned.
B. Position key (item 39) to pump shaft.
C. Apply Loctite #242 (or equivalent) to the threads
of the cap screw used to secure hub to pump shaft.
D. Slide hub onto pump shaft and secure with
spacer (item 28) and cap screw (item 29). Torque
cap screw from 27 to 33 ft--lb (37 to 44 N--m).
5. Inspect threads andsealing surfacesofhydraulic fit-
tingsandhydraulichoseconnectors.Replace anydam-
aged or worn fittings or connectors.
6. Lubricate and place new O-- rings onto all removed
hydraulic fittings. Install fittings into pump openings
makingsure thatfitting orientationisas notedduring re-
moval. Tighten fittings(see Hydraulic FittingInstallation
in the General Information section of this chapter).
7. Position pumpassemblyto pump adapteron engine
and align pump hub with rubber coupling (item 8). Se-
cure pump assembly to pump adapter with two (2) cap
screws (item 17), lock washers (item 16) and flat wash-
ers (item 3).
8. Secure pump hub to rubber coupling (item 8) with
two (2) capscrews (item 10),flat washers (item9), cou-
pling spacers (item 7) and lock nuts (item 6).
CAUTION
The neutral arm extension spring is under ten-
sion and may cause personal injury during
installation. Use caution when installing the
spring to the pump neutral arm.
9. Connecttheextensions pringtotheneutralarm(Fig.
44).
10.Connect the tractioncontrol cable totheneutral arm
(Fig. 43):
A. Secure traction cable ball joint to neutral arm.
B. Secure control cable to neutral arm with cable
jam nuts. Make sure that a washer is positioned on
each side of the neutral a rm.
11.Remove plugs from hydraulicfittings and hoses that
were placed during pump removal.
12.Using labels placed during pump removal, lubricate
newO--ringsandconnecthydraulichosestogearpump
andpistonp umpfittings.Tightenhoseconnections(see
Hydraulic Hose and Tube Installation in the General In-
formation section of this chapter).
13.Make sure that gear pump inlet hose is installed to
pump fitting and secured with hose clamp. Remove
clamp from gear pump inlet hose.
14.Check oillevelinhydraulic reservoirandadd correct
oil if necessary.
15.Follow Hydraulic System Start--up procedures (see
Hydraulic System Start--up in this section).
16.Checkneutralpositiono fthetractionpedal.Ifadjust-
mentis required,see AdjustTransmission forNeutral in
the Traction Unit Owner’s Manual.
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