Multi Pro 1200/1250 Hydraulic SystemPage 4 -- 25
Shaft Seal Replacement (Fig. 21)
IMPORTANT: Donotattempt topryseal outofpump
housing. This can damage the shaft seal bore so oil
will leak past the seal.
1. Remove retaining ring (Item 1).
2. Punch two (2) holes in face of shaft seal (item 2),
180
o
apart, and install metal screws into seal. R emove
shaft seal from gear pump by grasping and pulling on
screws. Discard shaft seal.
3. Remove spacer (item 3).
4. Thoroughly clean seal boreanddrives haft of pump.
5. Install spacer (item 3) on driveshaft.
6. Apply grease or petroleum jelly to inside diameter of
new seal.
7. Use a seal sleeve or tape on drive shaft to protect
seal during installation.
8. Position new shaft seal (item 2) onto shaft with part
number facing out. Use a seal installation tool to install
new seal. Make sure seal is installed square with seal
bore and that seal is pressed just below retaining ring
groove.
9. Install retaining ring (item 1).
Pump Disassembly (Fig. 21)
1. Remove shaft seal (see Shaft Seal Replacement
above) and spacer.
2. Remove relief valve (see Relief Valve Service
above).
3. Matchmarkthegearhousingwiththestatorforprop-
er orientation of these parts during assembly.
IMPORTANT: Use caution when using a vise to
avoid distorting any pump components.
4. Secure flange end of pump in a vise with drive shaft
facing down. Use of a vise with soft jaws is recom-
mended to prevent pump damage.
5. Remove eight (8) screws.
6. Support gearhousing (item18)andgently taphous-
ing with a soft face hammer to loosen from stator (item
24).Separategearhousingfromstator.Becarefultonot
drop any parts or disengage gear mesh.
7. Before removing gears (items 19 and 20), apply
marking dye to mating teeth to retain “timing” and loca-
tion for assembly purposes.
8. Remove drive gear (item 20) and woodruffkey (item
13) from drive shaft.
9. Remove idler shaft assembly (items 12, 19 and 21)
from stator. Remove crescent rings and then idler gear
(item 19) from idler shaft.
10.Locate and remove dowel pins (item 23) from stator
or gear housing.
IMPORTANT: When removing gasket (item 22) from
pump, note gasket color. Use new gasket of same
color for assembly.
11.Removegasketfrombetweengearhousingandsta-
tor.
12.Press drive shaft and bearing assembly (items 14,
12 and 4) out of stator.
IMPORTANT: When removingbearing andcrescent
rings from drive shaft, do not slide bearing or cres-
cent rings over seal area of drive shaft.
13.Remove inner crescent ring, then remove bearing
and second ring from drive shaft.
Inspection
1. Wash all parts in cleaning solvent.
2. Check all parts for burrs, scoring, nicks, etc.
3. Clean seal bore and drive shaft of pump so they are
free of any foreign material.
4. Checkneedlebearingsinstatorandgearhousingfor
excessive wear or damage. If gears (items 19 and 20),
needlebearings(item15),gearhousingorstatorareex-
cessively worn, scored or damaged, replace pump.
5. Check bearing (item 4) for s mooth operation. Re-
place bearing if loose on shaft or noisy when rotated.
6. Inspect woodruffkey (item 13) and key slots in shaft
for wear or damage and replace parts as necessary.
Pump Assembly (Fig. 21)
IMPORTANT: When installing bearing and crescent
ringsondriveshaft,donotslidebearingorcrescent
rings over seal area of drive shaft.
1. Install outer crescent ring on drive shaft (item 14),
then install bearing (item 4) and second crescent ring.
Slide drive shaft and bearing assembly into stator.
Hydraulic
System
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