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Preliminary inspection can now be carried out
without further dismantling; i.e. condition of
timing gears or movement in the bearings.
•
If all is found to be satisfactory, refit in
reverse order.
Repair:
To repair the bearing housing assembly you will
need the parts contained within the appropriate
Repair Kit, in addition to any new gears (6) or
bearings
(4
&
5)
distributer for details.
6.13 GEARBOX SHAFTS, GEARS
AND BEARINGS
If the shafts are to be removed for any reason,
label all components including bearing outer races,
shims etc. and keep in their correct positions.
With the pump disconnected from its drive.
•
Remove the rotor case (see 6.7 ROTOR CASE),
drain oil via the plug (14) and remove the
gear cover (11).
•
Bend down the tab washers (7) which lock
the gear nuts (8).
•
Before loosening the gear nuts (8) lock the
rotors on the shaft using the plastic block
supplied for this purpose. Loosen the gear
nuts (8) using a C-spanner.
•
Remove the gear nuts (8), tab washers (7),
timing gears (6) and drive shaft keys (28),
from the shafts.
Note: On HP3 sized pumps there is a second tab
washer (7a) and gear nut (8a) between the gears
(6) and the rear bearings (4)
•
Using a light press or soft hammer, drive out
the shafts (24 & 25) towards the front (rotor
case end) of the bearing housing (1) (Figure
33). This will push out the front oil seals (23).
Figure 33 - Removing shafts
required.
Contact
your
The inner race of the rear bearing (4) will slide off
the shaft. Be careful that it does not fall off.
Alternatively, prize out the front lip seals (23) first
with a sharp tool. Take care not to damage the
bearing housing or journals of the shaft during
this operation.
Stainless steel bearing housing
option only: The aluminum and stainless steel
components of the bearing carriers are machined
as an assembly and should never be dismantled.
•
The outer races of the bearings (4 & 5) can
be pulled out of the housing (1).
•
To remove the inner race of the front bearing
a press will be required.
Re-Fitting:
Assemble in the reverse order, checking and re-
adjusting the bearing pre-loads.
(6.14 BEARING SET-UP AND PRE-LOAD)
6.14 BEARING SET-UP AND PRE-
LOAD
Each shaft is supported on 2 taper-roller bearings
front (5) and rear (4) which are preloaded to
prevent any end-float (sideways movement) of
the shafts (24 & 25).
If any movement is detected in either shaft (side
to side or axially) new bearings must be fitted
(6.13 GEARBOX SHAFTS, GEARS AND BEARINGS)
and correctly pre-loaded.
Assembly of the shafts is as follows:
SAFETY: Bearings inner races require
heating to 140°C (230°F). Protective gloves are
essential.
ATTENTION
•
USE GLOVES: Heat only inner races of front
bearings (5) and assemble onto the shafts (24
& 25) making sure they are square and
pressed tight against the shaft shoulder,
ensure bearings are in the correct orientation.
(Figure 34)
34
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