Godwin HS150 - Reassembly

OPERATOR Book No.: 95-0014-0000/A
HANDBOOK Issue: 06
Page 12 of 30
7.2.2 Reassembly
New seals and O-rings must be fitted when reassembling. It is also prudent to fit a new impeller retaining nut.
1. Heat both bearings (47 & 48) 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. When to temperature, slide the roller bearing inner race (47) up hard against the shaft shoulder, fit the bearing
inner and outer (12) spacers and slide the ball bearing (48) up hard onto the spacers. Hold them in position for a
minimum of 30 seconds. Use the locknut (49) fitted without the tab washer 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 (49), fit the locking washer (50) and refit the lock nut. Knock up at least two tags on
the locking washer to secure.
4. Press the roller bearing inner race down to the bottom of the bearing bracket (10) bore. Fit plugs (84) to the internal
channels at the pump end of the bearing bracket.
5. Press the shaft assembly into the bearing bracket from the motor end until it is clamped hard together.
6. Fit an O–ring (36) to the bearing cover (11) and for 10022 pumps attach the cover to the bearing bracket with
screws (60). On HS150 pumps place the cover in position.
7. Fit the hydraulic motor (76) and O-ring (34) to the bearing cover (11) and secure with half nuts (65) for HS100
pumps or full nuts (65) for HS150 pumps and spring washers (68). Check to see that the oil seal in the front of the
motor has been removed (see section 5.2 details).
CAUTION. Failure to remove the hydraulic motor oil seal will block the oil feed to the bearings. Damage to the
bearings will result.
8. 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.
9. Carefully slide the rotating parts of the mechanical seals (39 & 40) over the shaft until they abut the seal seat.
10. Place an O-ring (35) in the groove in the back of the rear wear plate (4), place the seal seat (20) in position and
secure with circlip (43).
11. Fit the rear wear plate (4) to the bearing bracket assembly using screws (HS100 – 55; HS150 – 58) and spring
washers (68) having first fitted an O-ring (37) to the bearing bracket.
12. Fit the key (9) and impeller (3) to the shaft. Secure with the impeller retaining nut (63) and washer (14).
13. Measure the clearance between rear of impeller and rear wear plate. Remove the impeller and add shims (HS100
– 95; HS150 – 95, 96 & 97) as necessary to obtain the clearance given in the Technical Data section.
14. 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.
15. Fit the front wear plate (5) to the pump body (1) using screws (HS100 – 58; HS150 - 59) and spring washers
(HS100 – 69; HS150 - 68).
16. Fit the pump body (1) to the bearing bracket, wear plate and impeller assembly with screws (HS100 – 55; HS150 -
58) and spring washers (68). Measure the clearance between the front of the impeller and front wear plate.
Remove the pump body from the assembly, detach the wear plate from the pump body and fit shims (HS100 - 97,
98 & 99; HS150 - 94) to obtain the clearance given in the Technical Data section. Reassemble and recheck.
17. Attach the strainer (16) to the pump body with screws (HS100 - 57; HS150 - 60) and spring washers (68).
18. HS100 pumps: -Attach the lifting bracket (17) to the pump body using set screws (56) and spring washers (68).
HS150 pumps: - Attach the lifting bracket (17) to the pump body with screws (59), plain (71) and spring (68) and
with nuts (64), bolts (55) and washers (71) to the extension pipe (6).
19. Fill the seal chamber with oil (see Technical Data section) ensuring that no air pockets remain and plug off with
plug (83).
Assembly is now complete, but before attaching the hydraulic lines, the unit must be partially filled with hydraulic oil to
prevent dry running on start up.