Service Manual

Groundsmaster 4300--D Hydraulic SystemPage 4 -- 75
IMPORTANT: Mark the relative positions of the gear
teeth and the thrust plates so they can be reassem-
bledin the same position. Do not touch the gear sur-
faces as residue on hands may be corrosive to gear
finish.
7. Remove the thrustplates 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.
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.
Disassembly (Fig. 72)
1. Apply clean hydraulic oil to all parts before assem-
bling.
NOTE: Pressure seals and back--up rings fit ingrooves
machined into thrust plates. Body seals fit in grooves
machined in body faces.
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.
3. Afterpump has been assembled,tighten cap screws
and nuts by hand. Rotate the drive shaft to check for
binding. Protect the shaft if using a pliers.
4. Tighten the cap screws and nuts evenly in a crossing
pattern to a torque of 33 ft--lb (45 N--m).
Figure 73
DIAGONAL LINE
Hydraulic
System