3-4
c. Reassembly
1.
Install the pump end thrust washer on the two
dowel pins located on the bearing head. (See Figure 3-4.)
CAUTION
Ensure that thrust washer does not fall off dowel
pins while installing oil pump.
2.
Install the bearing head assembly with a new
gasket on the compressor crankshaft. Carefully push oil
pump on by hand ensuring that the thrust washer remains
on the dowel pins, the tang on the end of the drive
segment engages the slot in the crankshaft, and the oil
inlet port on the pump is aligned with the oil pickup tube
in the crankcase. The pump should mount flush with the
crankcase and should be oriented as shown in Figure 1-1.
3.
Align the gasket and install the eight capscrews
in the mounting flange. Refer to Table 3-1, for applicable
torque values.
3.4.3 VANE PUMP
a. Removal
1.
Remove four capscrews, gaskets and remove oil
pump cover; this will free the oil feed guide retaining
spring, cover gasket, and the oil feed guide. (See
Figure 3-7.)
2.
Remove the two drive segment capscrews and
lock washer and remove the drive segment.
3.
Remove eight capscrews and remove oil pump
bearing head assembly and gasket. (See Figure 3-4.)
b. Disassembly, & Inspection
If it was determined that the oil pump was not
operating properly, it is recommended that the entire oil
pump and bearing head assembly be replaced to ensure
trouble-free operation. However, if the cause of oil pump
failure can be determined in the field and replacement
parts for the pump are available, the pump can be
repaired. The pump end bearing is integral with the
bearing head and is not replaceable.
1.
Remove the plunger snap ring with snap ring
pliers. As each snap ring is removed, the spring guide,
plunger spring, and plunger may be removed from the
cylinder in the bearing head. Identify parts to ensure
replacement in same cylinder.
2.
Push the pump rotor out of the bearing head by
forcing against the rotor. Apply force from the bearing
side and remove rotor from the opposite side. The pump
rotor retaining ring will come out with the rotor.
3.
Clean all parts; coat all moving parts with
compressor oil before proceeding with reassembly.
4.
Insert the pump rotor into the bearing head from
the side opposite the bearing, with the rotor retaining
ring in place on the rotor. Install the rotor retaining ring
with the chamfered edge in. Compress the retaining ring
(close gap) in order to fit the rotor and ring into their
proper positions.
5.
Insert one of the plungers into a cylinder in the
bearing head (flat end in); then insert the plunger spring
and spring guide. Insert retaining ring with ring pliers.
Force the spring guide down to compress the plunger
spring and to allow the retaining ring to fit into its locking
groove. Follow the same procedure to reassemble the
other plunger spring, guide and snap ring in its plunger
cylinder.
8
15
14
13
5
12
11
10
9
7
6
4
3
2
1
1. Oil Pump Cover
2. Cover Gasket
3. Capscrews and
Lockwashers
4. Oil Pump Drive
5. Rotor Retaining Ring
6. Pump Vane Cylinder
7. Pump Vane
8. Vane Spring
9. Retaining Ring
10. Spring Guide
11. Bearing Head
12. Pump Rotor
13. Oil Feed Guide
14. Retainer Spring
15. Capscrews and
Washers
16. Oil Inlet Passage
TOP
16
4
11
5
12
3
Figure 3-7. Vane Oil Pump
c. Reassembly
1.
Install the bearing head assembly with a new
gasket on the compressor crankshaft. Carefully push oil
pump on by hand ensuring that the bearing head mounts
flush to the crankcase body. The top of the bearing head
is marked on the mounting flange.
2.
Align the gasket and install the eight capscrews
in the mounting flange. Refer to Table 3-1, for applicable
torque values.
3.
Install the drive segment with the two capscrews
and lock washer.
