Groundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 83
IMPORTANT: Use caution when clamping gear
pumpinavisetoavoiddistortingany pumpcompo-
nents.
3. Secure the front cover of the pump in a vise with the
drive shaft pointing down.
4. Loosenthefour(4)capscrewsthatsecurepumpas-
sembly.
5. Remove pump from vise and remove fasteners.
6. Supportthepumpassemblyandgentlytapthepump
case with a soft face hammer to loosen the pump sec-
tions. Be careful to not drop parts or disengage gear
mesh.
IMPORTANT: Mark therelative positionsof thegear
teeth and the thrust plates so t hey can be reassem-
bledinthesameposition.Donottouchthegearsur-
faces as residue on hands may be corrosive to gear
finish.
7. Removethethrustplates andseals fromeach pump
section. Before removing each gear set, apply marking
dye to mating teeth to retain ”timing”. Pump efficiency
maybe affectedifthe teetharenot installedin the same
positionduringassembly.Keepthepartsforeachpump
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.
Assembly (Fig. 62)
1. Apply clean hydraulic oil to all parts before assem-
bling.
NOTE: Pressure seals and back--up gaskets fit in
grooves machined into thrust plates. Body seals fit in
grooves machined in body faces.
2. Assemblepump sections starting atfrontcover end.
Apply grease or petroleum jelly to new section seals to
hold them in position during gear pump assembly.
3. Afterpumphasbeenassembled,tightencapscrews
byhand.Rotatethedriveshafttocheckforbinding.Pro-
tecttheshaftifusingapliers.
4. Tighten the four (4) cap screws evenly in a crossing
pattern to a torque of 33 ft--lb (45 N--m).
1. LH and RH PTO pump section
2. Front PTO pump section
3. Steering, lift/lower and charge pump section
4. Engine cooling fan pump section
Figure 64
2
3
1
4
Hydraulic
System
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