31 - 2
Dismantling and Assembly
Before removing and dismantling the pump, check flow and
pressure. If either of these are low the pump must be
changed. Renewal of components such as gears, bearings
and housing will not effect a permanent cure. If the pump
output is satisfactory but there is external leakage, the pump
should be removed and dismantled for re-sealing only.
Before removing and dismantling the pump, make sure the
exterior of the pump and working area is thoroughly cleaned
and free of possible sources of contamination.
Dismantling
1 Remove drive gear 1 and key 4 using a suitable puller,
do not lever or hammer as this will result in internal
damage to the pump.
2 Remove sharp edges and burrs from the shaft to avoid
seal damage.
3 Mark body 5 and flange 6 to ensure correct assembly.
4 Undo nuts 13 and separate body 5 from flange 6, slide
the flange off square to the shaft. Take care not to
damage machined faces by prising them apart - use a
soft faced hammer.
5 Use a drift to remove the outer shaft seal 15, then
remove circlip 16 and inner shaft seal 17. Take care not
to damage the shaft seal recess.
6 Remove drive shaft 20 and balance plate 21 then
remove driven gear 24 and balance plate 25. Note the
positions of balance plates 21 and 25 to ensure correct
assembly.
Inspecting
1 Remove and discard all seals. Remove sealant from
flange 6 and body 5.
2 Inspect 'O' ring groove and shaft seal recess in
mounting flange 6, make sure there is no damage and
is free of burrs.
3 Check that the mating faces on the mounting flange 6
and body 5 are not scored.
The pump must be renewed if:-
The PTFE coated bearings in the body or flange are worn
through so that the bronze base is visible.
The gear side faces or balance plates are scored.
The drive shaft has a wear groove where the shaft seal lips
run.
For Assembling see next page.
Section E Hydraulics
9803/7130
Section E
31 - 2
Issue 1
Main Pump
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