Generac — WARNING
A Generac service procedure — check it applies to your exact model before use.
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Before you start
- Before attempting to service the pump, read this manual carefully. Also review all
- If this pump is used to handle any hazardous materials that can cause injury or illness,
- s by wearing approved protective clothing and use appropriate safety
- Use lifting and moving equipment that is in good condition and that has adequate
- that all work must be performed by qualified personnel.
- when removing the impeller.
- The shaft will not rotate. Tighten bearing housing jack screws until .010 to .020 in (.25 to .50 mm) increase in
- Over-filling with oil can result in premature failure of bearings.
- S
- ous materials that can cause injury or illness,
- IT IS RECOMMENDED THAT THE PRESSURE RELIEF VALVE ASSEMBLY BE
Procedure
- Disconnect the battery cables.
- Store the unit off the ground so no water will accumulate around the equipment.
- Protect unit from blowing sand and dirt.
- Stack no other items on top of pump/equipment.
- Protect unit from the entry of any animals.
- Periodically rotate shaft to lubricate bearings and protect bearings from brinelling.
- Protect unit with approved drying agents.
- Ensure all bare metal areas are coated with rust preventative.
- Inspect unit every four weeks and replace drying agents (Silica Gel) as required, or a minimum of every
- Keep an inspection record showing dates of inspection with any maintenance preformed and condition
- Before use, ensure that all rust protection has been removed. Also, remove any foreign material that
- Before use, remove all drying agents (Silica Gel).
- Pump not primed
- Suction line not filled
- Air pocket in suction line
- Suction inlet or foot valve
- System head higher than
- System head lower than pump
- Insufficient NPSH
- Parallel pump application is
- Suction pressure to vapor
- Suction lift too high
- Excess vapor in pumpage
- Specific gravity of pumpage
- Viscosity of pumpage different
- Operation at below rated
- Cavitation
- Electrolysis
- Impeller obstructed
- Wrong-rotation direction
- Low speed
- Air leak into suction line
- Air leak through mechanical
- Seal fluid contaminated, hot or
- Seal fluid system not vented
- High speed
- Mechanical seal insufficient
- Bearing housing excessively
- Low oil pressure (oil lube bear-
- Improper or poor lubrication
- Lubrication defective
- Dirt in lubrication/bearings
- Moisture in lubricant/bearing
- Lubricant excess
- Pipe strain
- Temperature growth
- Misalignment
- Coupling improperly installed
- Impeller installed backwards
- Wear rings worn
- Impeller damage
- Improper balance (after
- Bent shaft
- Excessive thrust
- Rotational element dragging
- Worn or incorrectly installed
- Mechanical seal not properly
- Shaft scored at seal
- Volute O-ring
- Foundation not rigid or settle
- Suction line collapsed
- Not enough liquid in casing
- Suction check valve contami-
Tools required
- (237 Nm), maximum of 235 ft-lb (118 Nm). Do not allow the shaft
- ent
- ent
- puller
- puller
- puller
- gauge
- gauge
- gauge
Specs & torque values
- 237
- 118
- 175
- 235
- of .025 to .035 in (.63 to .89 mm) between the impeller and the seal plate is
- between the impeller and the rotating assembly with the rotating assembly sitting on the
- is achieved.
- can be determined by taking measurements of the gap between the pump casing and the bearing
- is achieved at each corner of the bearing housing.
- can be opened on the ES- series without removing the rotating assembly by loosening the
- between the pump casing and the bearing
- until the above
- between the adjustment flange and the volute casing.
- 41207
Source: manual:41207.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.