Section 08 PROPULSION SYSTEM
Sub-Section 02 (JET PUMP)
08-02-9
Brush and clean impeller shaft threads, impeller
and drive shaft splines with Loctite Safety solvent
755 (P/N 293 800 019) or equivalent. Free threads
and splines from any residue.
PARTS INSPECTION
20, Impeller
Visually inspect impeller splines. Check for wear
or deformation. Renew parts if damaged.
NOTE:
Check also PTO flywheel and drive shaft
condition. Refer to PROPULSION SYSTEM 08-03.
Examine impeller in wear ring for distortion.
Check if blade tips are blunted round, chipped or
broken. Such impeller is unbalanced and will vi-
brate and damage wear ring, impeller shaft, shaft
seal or bearings. Renew if damaged.
1. Replaced if blunted round or damaged
Check impeller for cavitation damage, deep
scratches or any other damage.
1. Check for cavitation, deep scratches or other damage
21, Wear Ring
Check wear ring for deep scratches, irregular sur-
face or any apparent damage.
If impeller/wear ring clearance is too large and im-
peller is in good shape, renew wear ring.
22,24, Needle Bearing and Impeller
Shaft
WEAR
Inspect needle bearings and their contact surface.
Check for scoring, pitting, chipping or other evi-
dence of wear.
With your finger nail, feel contact surface of seal.
If any irregular surface is found, renew impeller
shaft.
Install bearings, then install impeller shaft and ro-
tate it. Make sure it turns smoothly.
RADIAL PLAY
Radial play is critical for jet pump unit life span.
Radial play of impeller shaft is checked with shaft
in housing, without impeller.
Retain housing in a soft jaw vise making sure not
to damage housing lug.
Set a dial gauge and position its tip onto shaft end,
close to end of threads.
Move shaft end up and down. Difference be-
tween highest and lowest dial gauge reading is
radial play.
Maximum permissible radial play is 0.05 mm
(.002 in).
-
CAUTION
Be careful not to damage impeller shaft di-
ameter.
F02J0VB
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