MDX [en-US]
31
1
End Cover
2
End Cover Fasteners
3
Upper Housing
4
Oil Fill Port
5
Upper Housing
Fasteners
6
Lower Housing
7
Adjustment Screw
8.3.3
Installing End Covers and Seals
CAUTION
Flinger and labyrinth seal clearances must be verified. Failure to do so may result in damage to the seals,
overheating, and bearing damage.
Before installing the end covers, carefully inspect the labyrinth oil seal grooves for any grease residue, chips, burrs or
other debris and clean if necessary. This is essential to their proper operation.
End cover shims used on Limited End Float (LEF) and Duo-Cone seal units require special sealing. After determining
the correct number of shims as described in Section 8.3.2 "Closing the Housing", apply a very thin coat of RTV silicone
sealant to each shim as it is stacked on the end cover so each contact surface will be sealed. Remove any excess
sealant from the inside of the cover. Install and torque end cover bolts immediately. If sealant begins to cure, it will be
necessary to remove it and start over.
For converntional units, install the thrust end cover with 0.020" (0.5 mm) gasket to provide the correct pre-loading of
the thrust bearing.
Before installing the end cover nearest the pump, a measurement should be made to ensure that 1/4" to 5/16” (6 to 8
mm) clearance between the end cover and bearing races will be obtained after assembly. A 0.020" (0.5 mm) gasket is
also used with this end cover.
After both end covers are installed, measure the gap between the shaft and the inner diameter of each labyrinth seal
with a feeler gauge. A minimum gap of 0.005” (0.13 mm) is required all the way around or shaft damage may occur. If
necessary, the end cover may be shifted within the clearance at the housing bore before tightening in order to maintain
the minimum seal gap.
Apply a thin coating of grease to the end cover faces where the v-ring contact is made and install the v-rings.
Install the flingers so that their outer face is flush with the back of the seal face flange. This will ensure correct v-ring
compression. The split flingers clamp tightly to the shaft when bolted together and care must be taken to ensure that
the flinger does not cock during tightening or it will run out against the end cover. The best method is to bolt the halves
together directly in position rather than sliding over shaft after bolting. Gently tapping the flinger at intervals while
tightening will also help ensure that it is properly seated. After tightening the flingers, check their radial clearance with
the seal flange by running a wire gauge around the gap. A minimum gap of 0.020” (0.5 mm) should be present.
As a final check, rotate the bearing assembly by hand. Check the alignment of the flingers and listen or feel for any
rubbing.
1
0.005" Minimum
2
0.020" Wire
3
Flush back faces of the
flinger and labyrinth flange
Labyrinth seal clearance
Flinger clearance
8.4
Bearing Assembly Mounting
WARNING
Failure to install the bearing housing hold down bolts at this time may result in tipping of the bearing assembly
and possibly personal injury when the impeller is screwed on to the shaft.
1
2
3
4
5
1
2
7
6
1
2
3
Содержание GIW MDX
Страница 53: ...MDX en US 53 14 Notes...
