Milnor 72044SR2, Механические детали и сервисное обслуживание, Страница: 69 / 175

Pellerin Milnor Corporation
67
periodically through the plugged cleanout connections, in strict accordance with the preventive
maintenance procedures elsewhere.
If bearing replacement becomes necessary due to wear, it is essential that the bearings and seals
are replaced. Seal replacement requires removal of the bearing housing and seal sleeve. (In rare
instances where the seals are known to be in good condition, it is not necessary to remove the
bearing housing, seals or seal sleeve when a bearing is replaced.)
A pulling fixture is required
to remove the bearing housing. A set of guide rods, a seal sleeve setting fixture and a bear-
ing setting fixture are required for reinstallation of the housing.
These tools are available for
rental or purchase from the Milnor ® factory and are pictured elsewhere in this section. Contact
the factory two weeks in advance of repairs, when ordering these tools.
This maintenance is performed in the following order:
1. Remove old bearing(s). When removing both bearings, remove the front (soil side) bearing
first.
2. Remove bearing housings, seal sleeves, and seals.
3. If both bearings were removed, install the bearing housing, seal sleeve, seals, and new bearing
on the rear (clean side).
4. Install the bearing housing, seal sleeve, seals, and new bearing on the front (soil side).
5. Tighten bearing(s).
See the Main Bearing Assembly drawing for your machine for bearing component part numbers.
Removing the Bearing (Front or Rear)
BNWVUM02.T01 0000278621 A.4 A.5 A.3 3/12/20 11:54 AM Released
1. Loosen, then remove the main drive belts and cylinder shaft pulley (if applicable) by lowering
the drive base with the jacking bolts. Do not attempt to pry belts off with a pry bar or by roll-
ing the sheave. Remove the bearing cover (or shaft seal holder) to expose the bearing.
2. Bend back the locking tang on the bearing lock washer then remove the lock nut and lock
washer.
3. The center tapped hole in the shaft end is an oil passage through which oil may be forced be-
tween the tapered shaft and the bearing inner race. Install a pipe fitting into this tapped hole
as shown in
Figure 30: Connection From Hydraulic Pump to Assist in Bearing Removal, page
68 . Using a “Porta Power” or similar hand operated hydraulic pump, force fluid into the pas-
sage. Pump hard to build up fluid pressure. This pressure will cause the inner race to expand
slightly; just enough to free the tapered surfaces and allow the bearing to slip off easily. If the
bearing is not readily removed, remove the front water level inspection plate and use a timber
to pry up the cylinder to remove cylinder weight from the bearings. Once the bearing is re-
moved, the cylinder drops only approximately 1/32" before the shaft comes to rest on the
shaft support.
4. Slide the bearing off of the shaft and if it is to be reused, place it on a clean surface and cover
with a clean, lint free cloth.
Drive Assemblies