Greensmaster 3320/3420 Hydraulic SystemPage 5 -- 53
4. Loosenthefour(4)capscrewsthatsecurepumpas-
sembly.
5. Remove pump from vise and remove fasteners.
6. Supportthepumpassemblyandgentlytapthepump
housing with a soft face hammer to loosen the pump
section. Be careful to not drop parts or disengage gear
mesh.
IMPORTANT: Mark the relativepositionsof thegear
teeth and the thrust plates so they can be as-
sembledin thesameposition.Donot touchthegear
surfaces as residue on hands may be corrosive to
gear finish.
7. Remove the thrust plates and seals f rom pump. Be-
fore removing gear set, apply marking dye to mating
teethtoretain”timing”.Pumpefficiencymay beaffected
if the teeth are not installed in the same position during
assembly.
8. Turn front cover over, with seal side up.
IMPORTANT: Make sure to not damage the front
covercounterborewhenremovingthesealfromthe
cover.
9. Carefully remove retaining ring and shaft seal from
the f ront cover (Fig. 37). Discard removed seal.
10.Clean all parts. Check all components for burrs,
scoring, nicks or other damage.
11.Replace the entire pump assembly if any internal
pump components are excessively worn, scored or
damaged.
Gear Pump Assembly (Fig. 35)
NOTE: When assembling the gear pump, check the
markerlineonfrontcover,housingandendcoverto
make sure the parts are properly aligned during as-
sembly.
1. Apply clean hydraulic oilto all pump parts before as-
sembling.
2. Install new seal into front cover (Fig. 37):
A. Press shaft seal into front cover until it reaches
the bottom of the bore. Shaft seal should have the
seal lip and spring toward the inside of the pump.
B. Install retaining ring into the groove of the front
cover. Make sure that retaining ring is fully seated in
front cover groove.
NOTE: Pressure and back--up seals fit in grooves ma-
chinedintothrustplates.BodyO--ringsfitingroovesma-
chined in housing.
3. Assemble pump components starting at front cover
end. Apply grease or petroleum jelly to new section
sealstoholdtheminpositionduringgearpumpassem-
bly.
4. Afterpumphasbeenassembled,tightenfour(4)cap
screwsbyhand.Rotatethedriveshafttocheckforbind-
ing. Protect the shaft if using a pliers to rotate shaft.
5. Torque the cap screws evenly in a crossing pattern
to 33 ft--lb (45 N--m).
1. Drive shaft
2. Retaining ring
3. Shaft seal
Figure 37
1
3
2
Hydraulic
System
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