Hamilton Jet HJ212, Installation And Service Manual

Page: 76 / 198

Maintenance
Installation and Service Manual
Impeller check for wear and damage:
Look for corrosion and damage on all surfaces.
Check the impeller leading and trailing edges for damage or wear.
Marine bearing:
Check the marine bearing for scoring or localized wear. Replace if worn or damaged.
To check the bearing for wear:

Push the mainshaft hard from side to side.

Measure the total movement at the impeller tips, Refer to section: Marine bearing: on page 8-14, on
page 9-22.

Replace if necessary. Refer to section: Marine Bearing Replacement on page 9-29.
Dry run bearing:
Check every 100 hours or 50 dry starts:

If the wear on the bearing sleeve is greater than 2mm replace the sleeve and plastic bearing. Refer to
section: Marine Bearing Replacement on page 9-29.
The dry run bearing runs on only one half of the bearing sleeve.
If the sleeve shows signs of wear it can be turned end for end.
Reverse duct

Make sure that the reverse duct pivot pins and reverse cylinder attachment points are secure and that
there is no binding in the bushes.
Splash Guard

Check that the splash guard is secure and has enough clearance for the reverse duct.
Tailpipe, nozzle and nozzle housing

Check for corrosion damage or wear. Overhaul as required. Refer to section: Tailpipe Area Overhaul on
page 9-22.
Jet unit paintwork:
Refer to section: Jet surface coating procedure on page 8-2.
The main body of the jet unit is constructed from silicon-aluminium alloy (LM6) which is resistant to
corrosion from salt water.
The castings are finished in a polyurethane paint. Periodic cleaning down, wire-brushing and repainting may
be necessary depending on water conditions, and extent of use.
When the vessel is on the slip, preferably annually, the complete jet unit should be inspected internally and
externally for faults, corrosion, or breakages. Clean down and repaint the castings where necessary.
8-14