IMPORTANT: Use caution when clamping gear
pump in a vise to avoid distorting any pump compo-
nents.
8. Clean all pump parts. Check all components for
burrs, scoring, nicks and other damage.
9.
Replace the entire pump assembly if parts are ex-
3.
Secure the front cover of the pump in a vise with the
cessively worn or scored.
drive shaft pointing down.
Assembly (Fig. 39)
4.
sembly.
Loosen the four (4) cap screws thatsecure pump as-
1.
bling.
Apply clean hydraulic oil to all parts before assem-
5.
Remove pump from vise and remove fasteners.
NOTE: Pressure seals and back--up gaskets fit in
grooves machined into thrust plates. Body seals fit in
grooves machined in body faces.
6.
Supportthepumpassemblyandgentlytapthepump
case with a soft face hammer to loosen the pump sec-
tions. Be careful to not drop parts or disengage gear
mesh.
2.
Apply grease or petroleum jelly to new section seals to
hold them in position during gear pump assembly.
Assemble pump sections starting at front cover end.
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.
3.
byhand.Rotate thedrive shafttocheck for binding.Pro-
tect the shaft if using a pliers to rotate shaft.
After pump has been assembled, tighten capscrews
4.
pattern to a torque of 33 ft--lb (45 N--m).
Tighten the four (4) cap screws evenly in a crossing
7.
Remove the thrust plates and seals from each pump
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.
Groundsmaster 3500--D
Page 4 -- 105.2 Rev. F
Hydraulic System
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