Toro 04384 Service Manual page 96

IMPORTANT: If fittings are going to be removed
from piston pump, note position of fittings for as-
sembly purposes.
13.If fitting removal from piston pump is necessary,
mark hydraulic fitting orientation to allow correct assem-
bly. Remove hydraulic fittings and O--rings from piston
pump. Discard removed O--rings.
14.If necessary, remove the neutral assembly attached
to the piston pump (see Piston (Traction) Pump Neutral
Assembly in this section).
Piston Pump Installation (Fig. 40)
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 sure the flange surfaces of the gear pump and
piston pump are thoroughly clean.
IMPORTANT: A case drain exists in the piston (trac-
tion) pump and a suction port is near the input shaft
of the gear pump (Fig. 42). 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. If removed, secure coupler to piston pump shaft:
A. Make sure that pump shaft and bore of coupler
are thoroughly cleaned.
B. Position key (item 9) to pump shaft.
C. Apply Loctite #242 (or equivalent) to the threads
of the cap screw used to secure coupler to pump
shaft.
D. Slide coupler onto pump shaft and secure with
spacer and cap screw. Torque cap screw from 27 to
33 ft- -lb (37 to 44 N- -m).
5. Inspect threads and sealing surfaces of hydraulic fit-
tings and hydraulic hose connectors. Replace any dam-
aged or worn fittings or connectors.
Hydraulic System
6. Lubricate and place new O--rings onto all removed
hydraulic fittings. Install fittings into pump openings
making sure that fitting orientation is as noted during re-
moval. Tighten fittings (see Hydraulic Fitting Installation
in the General Information section of this chapter).
7. Secure pump assembly to engine bellhousing:
A. Position pump assembly to bellhousing on en-
gine and align pump coupler with flange coupler on
engine flywheel.
B. Insert pump coupler into flange coupler and slide
pump toward engine until pump flange is against
bellhousing surface.
C. Secure pump assembly to bellhousing with two
(2) cap screws (item 12) and flat washers (item 7).
8. Remove plugs that were placed during disassembly
from hydraulic fittings and hoses.
9. Using labels placed during pump removal, lubricate
new O--rings and connect hydraulic hoses to gear pump
and piston pump fittings. Tighten hose connections (see
Hydraulic Hose and Tube Installation in the General In-
formation section of this chapter).
10.Connect the traction control cable to the neutral arm:
A. Secure traction cable ball joint to neutral arm.
B. Secure control cable to neutral arm with cable
jam nuts. Make sure that a lock washer is positioned
on each side of the neutral arm.
11. Install muffler (Fig. 43). Refer to Exhaust System in
the Service and Repairs section of Chapter 3 -- Diesel
Engine for additional information on muffler installation.
12.Make sure that gear pump inlet hose is installed to
pump fitting and secured with hose clamp. Remove
clamp from gear pump inlet hose.
13.Check oil level in hydraulic reservoir and add correct
oil if necessary.
14.Follow Hydraulic System Start--up procedures (see
Hydraulic System Start--up in this section).
15.Check neutral position of the traction pedal. If adjust-
ment is required, refer to the Traction Unit Owners
Manual.
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