Toro Groundsmaster 455-D Service Manual page 121

Repair Information
Work in a clean area, cleanliness is extremely important
when repairing hydraulic pumps. Before disconnecting
the lines, clean port area of pump. Disconnect hydraulic
lines, removing pump assembly from vehicle and plug
ports. Thoroughly clean the outside of pump. After
cleaning then remove port plugs and drain oil.
Disassembly
1. Scribe a line, at an angle, across front plate (7), bo­
dies (2), adapter plate (16) and backplate (21). This will
assure proper reassembly.
NOTE: To maintain maximum pump efficiency, keep
body, gears and wear plates for each section together.
DO NOT mix parts between different sections.
2. Clamp pump in vise, shaft end up.
3. Remove the eight cap screws (9).
4. Remove pump from vise, hold pump in hands and
bump shaft against wooden block to separate pump
sections. Front body (2) will remain with either front plate
(7) or adapter plate (16).
5. Place front idler gear (13) back into gear pocket and
tap protruding end with soft face hammer to remove
front body (2) from the front plate (7) or adaptor plate
(16).
6. Remove adapter plate (16) from body (2) by tapping
on the adapter plate with a plastic hammer or rawhide
mallet.
7. Remove backplate (21) from body (2) by tapping on
backplate with plastic hammer or rawhide mallet.
8. Remove rear idler gear (13), slip fit gear (14) and key
(15).
9. Remove drive gear assembly (3) from adapter plate
(16).
10. Place rear idler gear (13) back into gear pocket and
tap protruding end with soft face hammer to remove rear
body (2) from the backplate assembly (21) or adaptor
plate (16).
Groundsmaster 455--D
11. Remove the wear plates (4) from front plate (7) and
adapter plate (16).
12. Remove o--rings (1) from front plate (7), adapter
plate (16), and backplate (21).
13. Remove backup gaskets (5) and balance pressure
seals (6) from front plate (7) and adapter plate (16) by
prying out with a sharp tool.
14. Remove shaft seal (10) and washer (11) from front
plate (7) by prying with a screw driver. Be careful not to
damage seal bore.
15. Remove relief valve (20) from backplate assembly
(21).
16. Remove O--ring (17), backup washer (18), and O--
ring (19) from relief valve (20).
Inspect Parts for Wear General
1. Clean and dry all parts.
2. Remove nicks and burrs from all parts with emery
cloth.
Gear Assembly Inspection
1. Check spline drive shaft for twisted or broken teeth.
Also check for damaged keyway, on drive shaft, that
drives the slip fit gear of the rear pump.
2. Inspect both the drive gear and idler gear shafts at
bushing points and seal area for rough surfaces and ex­
cessive wear.
3. Replace gear assembly if shaft is worn in bushing
area. (One gear assembly may be replaced separately;
shafts and gears are available as assemblies only. The
slip fit gear is available separately).
4. Inspect gear face for scoring and excessive wear.
5. Assure that snap rings are in grooves on either side
of drive and idler gears.
6. If edge of gear teeth are sharp, break edge with
emery cloth.
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Rev. C
Repairs