IMPORTANT: Use caution when clamping gear
pump in a vise to avoid distorting any pump compo-
nents.
NOTE: Pressure seals and back--up gaskets fit in
grooves machined into thrust plates. Body seals fit in
grooves machined in body faces.
3.
drive shaft pointing down.
Secure the front cover of the pump in a vise with the
2. Assemble pump sections starting at front cover end.
Apply grease or petroleum jelly to new section seals to
hold them in position during gear pump assembly.
4.
Loosen the four (4) cap screws thatsecure pump as-
sembly.
3. After pump has been assembled, tighten capscrews
byhand.Rotate thedrive shafttocheck for binding.Pro-
tect the shaft if using a pliers.
5.
Remove pump from vise and remove fasteners.
6.
Supportthepumpassemblyandgentlytapthepump
4.
pattern to a torque of 33 ft--lb (45 N--m).
Tighten the four (4) cap screws evenly in a crossing
case with a soft face hammer to loosen the pump sec-
tions. Be careful to not drop parts or disengage gear
mesh.
IMPORTANT: Mark the relative positions of the gear
teeth and the thrust plates so they can be reassem-
bledinthesameposition.Donottouchthegearsur-
faces as residue on hands may be corrosive to gear
finish.
1
2
3
7.
Remove the thrust plates and seals from each pump
4
section. Before removing each gear set, apply marking
dye to mating teeth to retain ”timing”. Pump efficiency
may be affected if the teeth are not installed in the same
position during assembly. Keep the parts for each pump
section together; do not mix parts between sections.
8.
Clean all parts. Check all components for burrs,
scoring, nicks and other damage.
9.
Replace the entire pump assembly if parts are ex-
cessively worn or scored.
Figure 64
Assembly (Fig. 62)
1.
2.
3.
4.
LH and RH PTO pump section
Front PTO pump section
Steering, lift/lower and charge pump section
Engine cooling fan pump section
1.
Apply clean hydraulic oil to all parts before assem-
bling.
Groundsmaster 4000--D/4010--D
Page 4 -- 83
Hydraulic System
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