C3977
C3978
C3979
Disassembly (continued)
GEAR PUMP 1.2
6. Procedure
4. Place the pump on it’s side. While disassembling
the unit, you need to mark the relative positions of
the gear mesh (drive gear tooth and idler gear tooth)
and the bearing blocks to the body so they can be
reassembled in the same position. Carefilly remove
the bearing block and gear set (fig. C3977).To
accomplish this, hold the pump body and push with
your fingers on the rear bearing block.
5. Remove the pressure seals taking note how the
pressure seals and teflon back up ring are installed
(fig. C3978). Check the seal quality. Replacement is
recommended whenever there are burrs, evidence of
extrusion, or marks caused by overheating. Carefully
remove the seals from the bearing blocks beginning
with the back up ring then the pressure seal (fig.
C3979). Do not use tools with sharpe edges to
remove the seals, as damage to the bearing blocks
can result. Dispose of any damaged seals.
6. Removal of the outer o-ring seals. Check the
quality of these two seals. If necessary, replace. Do
not use tools with sharp edges to remove the seals, as
damage to the housing may result. Disgard any
damaged seals.
7. Remove the shaft seal in the front flange (if
applicable). Place the flange on the work surface.
Using internal snap ring pliers, remove the snap ring.
Check the seal quality and remove it if necessary. To
remove, pry the bottom of the shaft seal and force it
out while rotating the flange to lift it out evenly. Do
not use the flange pilot to gain leverage as damage
may result. Use a plastic rod or wooden dowel as a
fulcrum. After removal, dispose of the damaged seal.
Push
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