Hydraulic Pump Reassembly & Installation - Allied Systems W8L Service Manual

Repairs - Hydraulic Pump Reassembly & Installation
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Hydraulic Pump Reassembly & Installation
1. Replace as new parts seal kit (9), O-Ring (3), and
shaft seal (17).
2. Tuck diaphragm seal (13) into grooves in front plate
with open part of "V" section down.
3. Press protector gasket (12) and back-up gasket (11)
into diaphragm seal.
4. Drop steel balls (15) into respective seats and place
springs (14) over balls.
5. Place diaphragm (10) on top of back-up gasket -
bronze face up.
6. Entire diaphragm must fi t inside raised rim of the
diaphragm seal.
7. Dip gear assembly into oil and slip into front plate
bearings.
8. Install dowel pins.
9. Apply a thin coat of petroleum jelly to both milled gear
pockets of body. Slip body over gears onto front plate
with half moon port cavities in body facing backplate.
Check if scribed location mark lines up.
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Figure 4-16 Hydraulic Pump
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13
12
11
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10. Install O-Ring (3) in groove of backplate.
11. Slide backplate over gear shafts until dowel pins are
engaged. Line up scribed location mark.
12. Place pump in vise, shaft down, and install capscrews
(1). Torque evenly 25 to 28 lb/ft. (33.9 to 38.0 Nm).
13. Oil shaft seal (17) with petroleum jelly and work
shaft seal over drive gear shaft taking care not to
cut rubber sealing lip.
14. Seat shaft seal carefully by tapping with plastic
hammer.
15. Add a generous portion of clean oil to both ports
to ensure that the pump is adequately lubricated.
Rotate pumpshaft by hand. Pump will have small
amount of drag but should turn freely after short
period of use.
16. Replace the driveshaft key (8).
NOTE: To prime the pump, fi ll it with heavy oil such
as SAE 90W prior to installation. This is important to
protect the pump from aeration during initial operation.
17
1. Capscrew
2. Backplate Assembly
15
3. O-Ring
4. Body
14
5. Dowel Pin
6. Drive Gear Assembly
7. Idler Gear Assembly
8. Key
9. Seal Package
10 . ..Diaphragm
11 . ..Back-up gasket
12 ..Protector gasket
13 . ..Diaphragm Seal
14 . Spring
15 . Ball
16 . Front Plate Assembly
17 . Shaft Seal