Toro 41188, Service Manual

Page: 80 / 353

Multi Pro 1750 Hydraulic System Page 4 − 32
Assembling the Hydraulic Pump (Fig. 23)
NOTE: When assembling the pump, check the V−
shaped marker line made before disassembly to make
sure components are properly aligned.
1. Lubricate new O−rings, pressure seals and back−up
seals with a thin coat of petroleum jelly. Lubricate all in-
ternal pump parts freely with clean Dexron III ATF.
2. Install new retaining ring and shaft seals into front
cover. Note orientation of seal lips during installation
(Fig. 25). Seals should be pressed into place until they
reach the retaining ring.
3. Install lubricated O−rings to the body.
4. Install lubricated pressure seals into the machined
grooves of the thrust plates and follow by carefully plac-
ing the back−up seals into the grooves.
5. Lubricate gear faces and bearing surfaces of drive
gear, idler gear and thrust plates with clean Dexron III
ATF. Carefully assemble thrust plates and gears noting
identification marks made during disassembly.
6. Position the pump body on its side. Carefully slide
thrust plate and gear assembly into the body cavity us-
ing identification marks made during disassembly.
7. Remove any excess lubrication from mating sur-
faces of body, rear cover and front cover. Make sure that
these surfaces are clean and dry.
8. Install dowel pins in body.
IMPORTANT: Do not dislodge O−rings, pressure
seals or back−up seals during final assembly.
9. Gently slide the rear cover onto the assembly using
marker lines for proper location. Firm hand pressure
should be sufficient to engage the dowel pins.
10.Place thin sleeve or tape on pump shaft to prevent
seal damage.
11. Position the pump with rear cover downwards. Care-
fully slide the front cover onto the assembly using mark-
er lines for proper location. Take care to not damage the
seals during front cover installation. Remove sleeve or
tape from pump shaft after front cover is installed.
12.Install the four (4) socket head screws with washers
and hand tighten.
IMPORTANT: When clamping the pump in a vise,
clamp only on mounting flange. DO NOT clamp
pump body in a vise.
13.Clamp mounting flange of pump in a vise with the
shaft end down.
14.Alternately torque the socket head screws 220 in−lb
(25 N−m).
15.If implement relief valve was removed from back
plate, install relief valve. Tighten relief valve to a torque
of 220 in−lb (25 N−m).
16.Put a small amount of Dexron III ATF in inlet port of
pump and rotate input shaft one revolution. Place cou-
pler on input shaft and use pliers on coupler to rotate
pump shaft. If input shaft binds, disassemble pump and
repeat assembly process.
17.Remove pump from vise.