Alamo HYDRO 15 - Manual (Page 54)

HYDRO 15 (Service Manual) 09/06
© 2006 Alamo Industrial Section 3 - 16
MOTOR SERVICE & REPAIR
Wear Tolerance for Pump & Motor:
This is suggested Wear Tolerance to Keep Assemblies operating as efficient as
possible, Not Complete failure rate. Your Pumps and/or motors may not be exact same as
discussed here.
Gear Housing: Gear type Pump and Motor
Wear in excess of .007" cut-out necessitates replacement of the Gear
Housing. Place a straight edge across the Bore in the cut out area. If you can slip
a .007" feeler gage under the straight edge in the cutout area. Replace the Gear
Housing.
Pressure pushes the Gears against the Housing on the Low-Pressure side.
As the Hubs and Bushings wear, the cutout becomes more pronounced.
Excessive cutout wear in short period of time indicates excessive pressure or Oil
contamination. If the relief Valve Settings are within prescribed limits check for
shock pressures or tampering. Withdraw Oil Samples and check it and tank for
dirt. Where cut-out is moderate, 0.007" or less, gear housing is in good enough
condition and may be reused, understand if you are at 0.007" you are at the upper
limits and will not be at peak performance. A pump should always produce at least
85% efficiency (Example: if your Pump is rated at 37 GPM it should produce at
least 32 GPM).
Gears:
Any scoring on Gear Hubs necessitates Replacement. Scoring, Grooving or
Burring of Outside diameter of Teeth requires replacement. Nicking, Grooving or
Fretting of Teeth surfaces also necessitates replacement.
Drive Shaft: (with Built on Gear)
If Gear Teeth and Gear Hubs are OK, Inspect Splines on input end (OD) of
Shaft and the Splines (ID) Output) Coupler End (Tandem Pump) for condition and
Wear.
Inspect Wear or damage to Seal Wear Area. If damage at Seal are check for
contamination. Note: Some Pumps and/or Motors may have Keyway or Splines.
Either will have to be inspected for condition. If Damage in any of these area the
Shaft / Gear will have to be replaced.
Thrust Plate:
The Thrust Plate Seals the Gear Section at the sides of the Gears. Wear will
allow internal slippage, which is Oil bypassing within the pump. The Pump and
Motor Thrust Plates are different even though they may look very similar. They are
built different. They will not interchange.
A Maximum of 0.002" wear is allowable. Replace Thrust Plates if they are
scored, eroded or pitted. Wear can be checked usually by comparing thickness
at outer edges with thickness at Gear contact area.
1. Check center of Thrust Plates where the Gears mesh. Erosion here indicates
Oil contamination.
2. Pitted Thrust Plates indicate cavitation or Oil aeration.
3. Discolored Thrust Plates indicate overheating, probably insufficient Oil.
Gear Teeth
Gear Hubs
Seal
Area
Splines
Gear Teeth
Thrust Plate
Cut-Out Area
Gear Wear Area
Gear Housing