Hamilton Jet HJ241, Manual

Page: 52 / 202

3.18
3 DESIGN BASICS
3.8 D
ESCRIPTION OF THE
D
RY
R
UN
S
YSTEM
(O
PTIONAL
E
XTRA
)
HJ-241 / HSRX
3.8.4 Fault Finding
3.8.5 Maintenance
INSPECTION:— Inspect every 100 hours, 50 dry
starts, or yearly, whichever is the soonest.
Remove the Tailpipe and inspect.
If the wear on the Bearing Sleeve is greater than
0.2mm, replace the Sleeve. Replace the plastic
Bearing when replacing the Sleeve.
NOTE: As the Dry Run Bearing runs on only one
half of the Bearing Sleeve, refer to Figure 26:
Dry Run Bearing Assembly. The Bearing
Sleeve can be turned end for end when it
shows signs of wear.
ASSEMBLY NOTES
1. When changing The 'Dry Run Bearing Assembly',
dismantle and reassemble the whole assembly
(plastic and metal shell) to the Tailpipe in the
same manner as removing / replacing a standard
rubber Marine Bearing. The plastic part of the
Bearing should be fitted so it sits closest to the
Impeller. The shell should sit flush with the
Tailpipe as shown on the diagram in
Section
3.8.6 Parts List .
2. The Bearing Sleeve is fitted to the Mainshaft in
the same manner as the Bearing Sleeve for the
rubber Marine Bearing
(Refer to Section 9 Over-
haul in this Manual).
NOTE: The Bearing Sleeve is hardened at one end
only. Assemble with the larger diameter end
(hardened end) nearest to the Impeller.
Table 4: Fault Finding
FAULT CAUSE REMEDY
Bearing jambs up when dry
running Excessive heat buildup.
May have grit in bearing
Run in water to cool.
Leave overnight to cool.
Flush out with clean water.
Clanging sound from the Jet Impeller hitting the Wear
Ring due to worn Bearing. Replace worn Bearing and / or Sleeve.
Check the Wear Ring and replace if dam-
aged.
Excessive scouring of
Water Bearing Sleeve Running in dirty water and
sucking sand or silt into Jet Be careful not to suck sand or silt into Jet,
do not use high RPM in water when starting
off.
Figure 25: Bearing Sleeve
DIAMETRICAL WEAR SHOULD
BE LESS THAN 0.2mm