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Always wear eye protection when operating or
performing maintenance on this pump.
Always turn off air supply and disconnect air supply
hose before installing, removing or adjusting any
accessory on this pump, or before performing any
maintenance on this pump.
LUBRICATION
Each time the Model 251A1 or 251A3 Sump Pumps are
disassembled for maintenance, repair or replacement of
parts, lubricate the pump as follows:
1. Inject Ingersoll–Rand No. 80 Grease into the three
Grease Fittings (3 and 40). Inject 1 to 2 cc into the
Grease Fitting (40) located in the Backhead (36) and
the Fitting (3) nearest the discharge in the Housing.
The other Grease Fitting (3) in the Housing leads to the
grease chamber on the automatic lubricator. Pump
grease into this Fitting until grease starts to seep from
the Grease Level Valve (5).
2. Place 15 – 20 drops of Ingersoll–Rand No. 50 Oil into
the air inlet. Unscrew the Oil Chamber Plug (37) and
fill the oil chamber with oil.
DISASSEMBLY
General Instructions
1. Do not disassemble the pump any further than
necessary to replace or repair damaged parts.
2. Whenever grasping a pump or part in a vise, always
use leather–covered or copper–covered vise jaws to
protect the surface of the part and help prevent
distortion. This is particularly true of threaded
members and housings.
3. Do not remove any part which is a press fit in or on a
subassembly unless the removal of that part is
necessary for repairs or replacement.
4. Do not disassemble the pump unless you have a
complete set of new gaskets and O–rings for
replacement.
Disassembly of the Sump Pump
1. If the Air Strainer Screen (35) is to be cleaned or
replaced, unscrew the Air Strainer Cap (33) and
withdrawn the Screen.
2. With the Motor Housing (1) clamped in
leather–covered or copper–covered vise jaws
horizontally, remove the Impeller Cover Cap
Screws (49), the Inlet (51), and the Impeller
Cover (52).
3. Remove the Arbor Nut (54) and the Impeller (56).
4. Reposition the Motor Housing in the vise vertically.
Unscrew the Housing Nut (16) and carefully remove
the Backhead (36).
All manuals and user guides at all-guides.com
MAINTENANCE SECTION
Disassembly of the Motor
General Instructions
Assembly of the Motor
16
5. While grasping the Governor Assembly (17) in one
hand, gently tap on the impeller end of the Arbor (47)
with a plastic hammer and withdraw the assembled
motor and Arbor.
6. Remove the Arbor from the Rotor (42). Remove the
Impeller Key (48).
7. If required, carefully remove the the Water Seals (4)
from the Housing. Remove the Front Arbor
Bearing (44) and the Arbor Bearing Spring (58) from
the Arbor (47).
In the following step, the Govenor Assembly (17)
has a left–hand thread; rotate the Assembly
clockwise to remove it.
1. Carefully unscrew the Governor Assembly.
2. Remove the Rear End Plate (14).
3. Remove the four Vanes (11) then the Cylinder (43).
4. Remove the Front End Plate (8).
5. If required, remove the Arbor Packing (9) from the
Front End Plate.
ASSEMBLY
1. Always press on the inner ring of a ball–type bearing
when installing the bearing on a shaft.
2. Always press on the outer ring of a ball–type bearing
when pressing the bearing into a bearing recess.
3. Whenever grasping a tool or part in a vise, always use
leather–covered or copper–covered vise jaws. Take
extra care with threaded parts and housings.
4. Except for bearing, always clean every part and wipe
every part with a thin film of oil before installation.
5. Check every bearing for roughness. If an open bearing
must be cleaned, wash it thoroughly in a suitable
cleaning solution and dry with a clean cloth. Sealed
or shielded bearing should never be cleaned. Work
grease thoroughly into every open bearing before
installation.
6. Apply a film of O–ring lubricant to all O–rings before
final assembly.
1. If required, reinstall the Arbor Packing (9) and the two
Arbor Packing Retainers (10), one on each side of the
Packing, in the Front End Plate (8).
2. Place the Front End Plate on the slotted end of the
Arbor (47) and the Arbor into the Rotor (42).
3. Slide the Cylinder (43) over the Rotor.
4. Apply a thin coat of Ingersoll–Rand No. 50 Oil to the
Vanes (11) and install them in the slots in the Rotor.
5. Place the Cylinder Dowel (13) in the hole in the
Cylinder.
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