Product Manual

58 Owner’s Manual for Dry-Prime Diesel Trash Pumps
Maintenance
Pedestal Bearing and Seals Removal
and Installation
1. Remove the vacuum pump pedestal assembly,
complete with lip seals, following the steps in
Crankshaft Removal and Installation.
2. Remove the seals from the housing.
3. Use a bearing drift to push out the pedestal
bearing.
4. Lubricate the new bearing an press it into the
housing until the bottom edges of the bearing and
housing are flush with one another.
5. Lubricate the seal housing and press in the lower
seal (lip nearest to bearing). (Assembly tool [P/N:
52655] is available to assist with assembly of the
lip seals in pedestal. Contact Generac Technical
Service.)
6. Press the wiper seal into the pedestal with wiper lip
uppermost.
Install the pedestal assembly and remaining components,
complete with lip seal, following the steps in Crankshaft
Removal and Installation. Check the bearing housing oil
level daily and add 10W-30 oil as necessary. Fill to the
center of the sight glass. Do not overfill.
Every six months or every 1500 hours, drain the bearing
housing and fill with fresh 10W-30 oil. If pumpage is seen
exhausting from the vacuum pump discharge, shut the
pump down and inspect the priming chamber.
Trailer Wheel Bearings
Some trailers are equipped with a grease fitting to allow
lubrication of the wheel bearings without the need to
disassemble the axle hub. To lubricate the axle bearings,
remove the small rubber plug on the grease cap, attach a
standard grease gun fitting to the grease fitting and pump
grease into the fitting until new grease is visible around the
nozzle of the grease gun. Use only a high quality grease
made specifically for lubrication of wheel bearings. Wipe
any excess grease from the hub with a clean cloth and
install the rubber plug when finished. The minimum
recommended lubrication is every 12 months or 12,000
miles (19,312 km). More frequent lubrication may be
required under extremely dusty or damp operating
conditions.
Storage
The unit is adequately prepared for outside storage prior
to shipment. Use the following list of additional suggestions
for extended storage.
Extended Storage Preparation
1. Disconnect the battery cables.
2. Store the unit off the ground so no water will
accumulate around the equipment.
3. Protect the unit from blowing sand and dirt.
4. Stack no other items on top of the pump/
equipment.
5. Protect the unit from the entry of any animals.
6. Periodically rotate shaft to lubricate bearings and
protect bearings from brinelling.
7. Protect unit with approved drying agents (Silica
Gel).
8. Verify all bare metal areas are coated with a rust
preventative.
9. Inspect unit every four weeks and replace drying
agents (Silica Gel) as required, or a minimum of
every six months.
10. Keep an inspection record showing dates of
inspection with any maintenance performed and
condition of drying agents (Silica Gel).
11. Before use, verify that all rust protection has been
removed. Also, remove any foreign material that
may have accumulated during storage.
12. Before use, remove all drying agents (Silica Gel).
13. Drain all water from the main pump piping,
including the suction line and discharge line.
Remove the volute drain plug and vent plug to
empty the pump casing.
14. Verify correct oil level in the engine and seal oil
reservoir. Add oil as necessary.
15. Add grease to the main pump bearing frame
fittings. Three to six strokes at each fitting with a
hand grease gun should be sufficient.
16. Jog the main pump motor for 10 to 15 seconds.
Install all plugs removed for draining.
Winter Storage
Follow the steps in Extended Storage Preparation.
Occasional motor starts once every month are
recommended. Run the unit until it reaches operating
temperature. This will help to replace and maintain a
lubricating film on the bearings and operating parts.
Commission Unit for Use
In installations where winter shutdown and storage is the
normal situation, it is recommended that lubricating oil and
seal barrier oil be drained and replaced to correct levels
before the beginning of each new season.
• Add fresh grease to the main bearing frame and
vacuum pump pedestal fittings
• Check all gasketed flanges, especially those on
the suction side of the pump, for bolt tightness to
eliminate the effect of air leaks on the priming time.