Toro Groundsmaster 4500-D Service Manual page 97

3. Remove pump from vise, hold pump in hands and
bump shaft against wooden block to separate front
pump sections. Front body (10) will remain with either
front plate (15) or front adapter plate (23).
4. Place front idler gear (16) into gear pocket and tap
with soft face hammer until the front body separates.
Remove idler gear from front plate or adapter plate.
5. Remove plug (8) from front plate (15).
6. Remove front adapter plate (23) from front body (10)
by tapping on the adapter plate with a soft face hammer.
7. Remove idler gear (21), slip fit gear (18), and key
(17).
8. Remove backplate (27) from rear body (26) by tap-
ping on backplate with soft face hammer.
9. Remove rear idler gear (25), slip fit gear (20) and key
(22).
10.Remove drive gear assembly (11) from rear adapter
plate (24).
11. Place rear idler gear assembly (25) back into gear
pocket and tap protruding end with soft face hammer to
remove rear body (26) from the backplate assembly (27)
or the rear adapter plate (24).
IMPORTANT: Note position of the open and closed
side of the wear plates before removing.
12.Remove the wear plates (12) and o--rings (4) from
front plate (15), front adapter plate (23), and rear adapt-
er plate (24).
13.Remove backup gaskets (14) and pressure seals
(13) from wear plates (15) by carefully prying out with a
sharp tool.
IMPORTANT: Do not damage the seal bore in the
front plate during seal removal.
14.Remove shaft seal (1) and washer (2) from front
plate (15).
15.Remove plug (7) and o--ring (9) from rear adapter
plate (24).
16.Remove proportional valve (6) from backplate as-
sembly (27).
Groundsmaster 4500--D/4700--D
Inspection
1. Clean and dry all pump components. Remove nicks
and burrs from all parts with emery cloth.
2. Check spline drive shaft for twisted or broken teeth.
Also check for damaged keyway, on drive shaft, that
drives the slip fit gears of the pump.
3. Inspect both the drive gear and idler gear shafts at
bushing points and seal area for rough surfaces and ex-
cessive wear.
4. Replace gear assembly if shaft measures less than
.873" (22.17mm) in bushing area. (One gear assembly
may be replaced separately; shafts and gears are avail-
able as assemblies only. The slip fit gear is available
separately).
5. Inspect gear faces for scoring or excessive wear.
6. Replace gear assembly if gear width is below 1.181"
(30.00 mm).
7. Assure that snap rings are in grooves on either side
of drive and idler gears.
8. If any edge of gear teeth is sharp, break edge with
emery cloth.
9. Oil groove in bushings in front plate, backplate and
adapter plates should be in line with dowel pin holes and
180 degrees apart. This positions the oil grooves closest
to respective dowel pin holes.
10.Replace the backplate, front plate or adapter plates
if l.D. of bushings exceed .879" (22.33mm) (Bushings
are not available as separate items).
11. Bushings in front plate and backup gasket side of
adapter plates should be flush with face of plate.
12.Check for scoring on face of backplate and adapter
plates. Replace if wear exceeds .0015" (.038mm).
13.Check bodies inside gear pockets for excessive
scoring or wear.
14.Replace bodies if l.D. of gear pockets exceeds
2.100" (53.34mm).
Page 4 - - 59 Hydraulic System (Rev. A)