18
6.3
Shaft Seal Replacement
When the shaft seal in the mounting plate shows signs of excessive oil leakage, it should be replaced. Before
attempting replacement of the seal, the pump must be disconnected from the vacuum system and from the power
outlet. New lip seal (P/N 41-2962) and new gasket (61-1119B) or seal replacement kit (Cat. No. 8890K-03)
should be available before attempting repair.
1.
Drain Oil
by opening the drain plug. The pump may be tilted to remove residual oil out of the oil case.
2.
Separate Base
from the pump by removing four socket head screws 10-32 x 5/8.
3.
Separate the Pump from the Motor Assembly
by removing four socket head screws 10-32x1 from
the motor adapter plate. For 8890A-55, the isolator valve coil should be slipped off by removing nut, name
plate and large washer from valve projecting from the inside of the mounting plate. Set aside the motor
assembly with isolator coil placed next to it.
4.
Remove Oil Case
from the pump by placing it on its mounting plate side and unscrew four socket head
screws 10-32x3/4.
5.
Remove Coupling
from the pump shaft by loosening the setscrew. Separate pump module from the
mounting plate by unscrewing three socket head screws 10-32x1/2 and three split lock washers. Discard
the gasket.
6.
Push out Lip Seal
out of the wear plate with a blunt edge of a screw-driver blade. Discard the lip seal.
Older models will have lip seal installed in the mounting plate.
7.
Install New Shaft Seal
with flat side of the seal toward the motor. Use a little oil on the lip seal outside
periphery. The seal is located 0.09 from the coupling end inside the bore. Seal assembly tool 61-2172A
used to install it.
8.
Place the Pump Module
on a table with shaft up. Slide shaft insertion tool 61-2170A over the shaft
end and place the new gasket over the modular assembly.
9.
Moisten the Lip Seal
, shaft and the tool with oil prior to the assembly. Slip the mounting plate over the
shaft of the modular pump.
10.
Adjust Gasket
in proper angular location and then tighten gradually 3 screws 10-32x1/2 with lock
washers.
11.
Assemble Coupling Body
to pump shaft all the way to the shaft shoulder and tighten the setscrew.
12.
Attach Oil Case
to the mounting plate using four socket head screws 10-32x3/4 with 4 lock washers.
Tighten screws gradually.
13.
Insert two dowel pins to the mounting plate and put the coupling spider in place.
14.
Attach Motor Assembly
to the mounting plate using four socket head screws 10-32x1 with lock
washers. For Model 8890A-55, watch for wires from the isolator valve coil to be placed in groove of
motor adapter plate during assembly. After carefully fitting all parts together cross tighten the four
screws gradually, then attach the coil to the isolator valve mechanism by first slipping on the coil houlder
and then the coil with name plate. Tighten the coil nut (name plate should turn freely).
15.
Attach Base to the mounting plate by means of four socket head screws 10-32x5/8 long.
16.
Finally pump is filled with
DIRECTORR® Premium Oil
and is ready to be inspected for its
performance.
Содержание 8890
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