Book No.: 95-0014-0000/A OPERATOR
Issue: 06 HANDBOOK
Page 9 of 30
7.1.2 Reassembly
New seals and O-rings must be fitted when reassembling. It is also prudent to fit a new impeller retaining screw.
1. Heat both bearings (39 & 40) with a temperature controlled bearing heater until they are a consistent 110°C. Do
not overheat or allow the bearings to remain at this temperature for longer than their fitting time.
CAUTION. Bearing races must be pressed into position and not hammered either directly or by drift. Direct
hammering will damage the bearing or rollers. Drift hammering will introduce swarf into the assembly. Either will
result in early bearing failure.
2. Once up to temperature, slide the roller bearing inner race (40) up hard against the shaft shoulder, fit the bearing
inner (16) and outer (17) spacers and slide the ball bearing (39) up hard onto the spacers. Hold them in position for
a minimum of 30 seconds. The locknut (41) fitted without the tab washer is suitable for this purpose. This allows
the races to grip the shaft and prevent them from creeping away from the shoulder during cooling. Let the
assembly cool completely.
3. Once cool, remove the lock nut (41), fit the locking washer (42) and refit the lock nut. Knock up at least two tags on
the locking washer to secure.
4. Press the shaft assembly into the bearing bracket (12) from the motor end until the back of the ball bearing race is
6-7 mm below the surface. Use the bearing cover (11) without an O-ring (46) to press the assembly to its final
position.
5. Remove the bearing cover (11), fit an O–ring (46), refit the cover and secure with screws (67).
6. Fit the hydraulic motor (55) to the bearing cover (11) and secure with screws (74). Note that the oil seal in the front
of the motor must be removed beforehand (see section 5.2.2 for details).
CAUTION. Failure to remove the hydraulic motor oil seal will block the oil feed to both the bearings and
mechanical seal. Immediate failure of the seal and damage to the bearings will result.
7. Clean the shaft thoroughly and lubricate with clean water or a diluted soft soap solution. Do not use heavy grease,
silicone or PTFE based lubricants, as these would prevent the seal from gripping the shaft.
CAUTION. Mechanical Seals are precision engineered devices. Extreme care must be taken to ensure that no
damage occurs to the lapped faces. These faces must be kept absolutely clean throughout the entire
installation. Do not touch them or allow any contaminant to come into contact with them. Soiled faces will have
to be cleaned with appropriate degreasing cleaner and soft tissue. Failure to observe these precautions will
lead to premature seal failure.
8. Carefully slide the rotating parts of the mechanical seal (52) over the shaft until they abut the shaft shoulder.
9. Press the stationary seat of the mechanical seal (52) into the seal housing (8). Fit an O-ring (46) to the outside
diameter and carefully press the assembly into the bearing bracket from the pump end.
10. Fit the rear wear plate (5) to the bearing bracket assembly using screws (72).
11. Fit the key (36), wearing sleeve (4) and impeller (3) to the shaft. Secure with the impeller retaining screw (68) and
washer (19).
12. Measure the clearance between rear of impeller and rear wear plate. Remove the impeller and add shims as
necessary to obtain the clearance given in the Technical Data section.
13. Refit the impeller, lock the assembly with a bar through the vanes of the impeller and torque the retaining screw to
the value given in the Technical Data section.
14. Fit the front wear plate (6) to the pump body (1) using screws (79), spring (97) and plain (89) washers.
15. Fit the pump body (1) to the bearing bracket, wear plate and impeller assembly with screws (75), spring (94) and
plain (87) washers. Measure the clearance between the front of the impeller and front wear plate and check that it
corresponds to the value given in the Technical Data section. If it is not correct then the build is incorrect and the
cause must be investigated before proceeding further.
16. Place a gasket (30) on the pump body (1), fit the extension pipe (2) and attach with screws (71) and washers (87).
17. Attach the strainer (24) to the pump body with screws (75), spring (94) and plain (87) washers.
18. Attach the lifting bracket (25) to both the pump body (1) and outlet pipe (2) using set screws (75), spring (94) and
plain (87) washers.
Assembly is now complete, but before attaching the hydraulic lines, the unit must be filled with hydraulic oil to prevent
dry running on start up. Ensure the unit is completely filled with no air locks before proceeding.
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