Service Manual 73
Page 18 of 32
REMOVE THE IDLER FROM THE PIN:
With the idler gear still on the cover, check for excessive wear between:
−
the pin and bushing,
−
the idler and cover crescent,
−
idler width and crescent height.
Any visible signs of excessive wear will require replacement of the cover/pin assembly and/or
the idler and the bushing.
If only the bushing shows signs of minor wear, it should be replaced. Acceptable bushing
clearances are shown in the Table 3 (for pumps with standard clearance only).
Note: Many Tuthill pumps are provided with non-standard clearances for use with high-
viscosity or high-temperature fluids. Consult the factory for clearances of these pumps.
REMOVE THE DRIVE MODULE ASSEMBLY FROM HOUSING:
If service is being completed with the housing still mounted to the baseplate/piping, you must
first remove the spacer from the spacer coupling.
Adequately support the housing ( on the cover side) so it will not fall.
Remove the bolts that hold the bracket to the housing.
On pumps that do not have a cast integral foot, remove the bolts that attach the
foot to the bearing carrier.
The drive module assembly can then be pulled from the housing as a single unit. Caution
should be used, as the drive modules can be heavy. The use of a lifting device may be
required.
REMOVE THE BALL BEARING ASSEMBLY:
Remove the bearing lock washer and locknut.
Remove the outer bearing cap hex head bolts.
Remove the bearing/bearing caps assembly. Note: If dirt or rust has gotten between the
bearing carrier and the bearing cap, then the bearing/bearing cap assembly may be difficult
to remove.
Remove the three bolts that hold the inner bearing cap in place and remove the inner bearing
cap.
Remove the outer bearing cap.
Remove the bearing from the shaft. There may be a slight press-fit between the shaft and
bearing. Use a bearing puller or other appropriate tool if required.
REMOVE THE SEAL OR PACKING:
A. Pumps with packing:
Remove the gland nuts and washers.
