Oil Pump Assembly/Installation - Polaris 1999 Sportsman 400 Service Manual

ENGIl\"E LOWER END 171
o
5, Remove the scave nge side inner rotor. outer
TO-
tor and dow el pin from the oil pump body. Keep
these part s togeth er as a set, do not intermi x with
feed rotors.
6. Withdraw the oil pump drive sha ft (F igure 136)
from
the pump body. Do not lose the washer located
between the pum p bod y and the sha ft shoulder.
7. Clean all part s in solvent and thoro ugh ly dry.
8. Inspect the feed cham ber cover, middle cover and
the oil pump body for wear, cracks or damage (A,
Figure 137). Check the inner wall for scull' marks.
9. Check the drive shaft bearing sur face in the
cover, middle cov er and the oil pump body for wear.
Insert thc drive sha ft into all three part s and rotate it
and check for smooth operation.
10. Inspect the feed set and the scavenge set of ro-
lars (8 . Figure 137) for abrasion, wear, cracks or
damage.
II . Inspect the drive sha ft and washer (Figure 138)
for wear or dam age.
i2. Install the dowel pins into the drive shaft and check
for a tight
fit.
If loose, replace the damaged partts),
Assembly/Installation
Re fer to Figure 123.
I. Coat all parts ofthe pump with clean eng ine oil.
2. Mak e sure the was her is in place on the o il pump
shaft, the n install the sha ft into the oil pump bod y
(Figure 139). Push it in until it stops (Figure 136).
3. Asse mble the scave nge side into the pump bod y
as follo ws:
a. Install the inner dowel pin into the pump shaft
and
center it
b. Install the inner rotor (A, Figure 140) and
properly index it with the dowel pin.