Blagdon Pump AP50 Submersible - Manual (Page 4)

3.2
Check freedom of movement of the upper governor section (48)
together with governor balls (31) & ball cage (30). Check for
wear or damage and replace as required.
3.3
Ensure that governor valve (45) is free by pushing against the
spring (44). If excessive wear is suspected, remove air hose union
(40) and withdraw governor valve. Check both valve (45) and
cylinder (34) bore for wear or damage and replace as required. If
o-rings (35) & (46) are damaged or attacked, replace as required.
3.4
Re-assemble the governor housing as above in reverse order. If
gasket (53) is damaged or soiled, replace prior to final assembly.
Ensure that an adequate supply of grease is pumped into the
housing via the grease nipple (67) prior to pump running.
Air Motor
3.5
Remove the governor housing as described above. Lift the air
motor assembly free from the pump, and place in a clean area.
Caution
In the event of the pump running without any lubrication, Rotor
Vane wear debris may be present within the air motor section.
Dust masks should be worn to prevent the inhalation of particles.
Using the cylinder bolts (51), screw into the upper bearing plate
(27) and 'jack' the plate off the cylinder body (20).
3.6
Check the rotor vanes (55) for excessive wear and replace as
required. Ensure that the springs (54) are correctly positioned
prior to re-assembly.
3.7
Both upper and lower bearings should turn freely, if difficulty is
experienced, replace immediately. Ensure all components are
clean prior to re-assembly.
3.8
Re-assemble the air motor as described above in reverse order. If
gasket (61) is damaged or soiled, replace prior to final assembly.
Ensure the slots of the coupling nut (63) are correctly engaged in
the impeller shaft (74) before fully tightening of the cylinder bolts
(51).