3-3
c. Reassembly
CAUTION
Set screw on crankshaft must be removed for
Low Profile Gear Pump (See Figure 3-4).
1.
Set screw on crankshaft must be removed for
Low Profile Gear Pump.
2.
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.
3.
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
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.
4.
Align the gasket and install the eight capscrews
in the mounting flange. Refer to Table 3-1, for applicable
torque values.
3.4.2 GEAR PUMP
a. Removal
Remove eight capscrews and remove oil pump
bearing head assembly, gasket and thrust washer. (See
Figure 3-4.)
b. Disassembly, & Inspection
If it was determined that the oil pump was not
operating properly, the entire oil pump and bearing head
assembly must be replaced. Replacement parts for the
pump are not available. However, in the event the pump
requires inspection or cleaning, disassembly and
reassembly instructions are provided below.
1.
Remove pump cover and O-ring. (See
Figure 3-6.)
2.
Note direction of pump by location of pin in
eccentric. The stamping in the eccentric next to the pin
shows the direction the pump will rotate,
as viewed from
the crankshaft end of the compressor
.
3.
If direction of oil pump is not the same rotation
as the crankshaft, remove pin. Pin can be removed by
holding eccentric in, tipping top of pin slightly outward,
and turning pump bottom side up; pin should fall out or
use magnet to remove pin.
4.
The remainder of the pump components can
now be removed, if so desired, by pushing out the drive
segment from the crankshaft end of the bearing head.
5.
Remove the relief valve assembly by removing
the retainer pin.
6.
Clean all parts; coat all moving parts with
compressor oil before proceeding with reassembly. Mark
outside of pump at the short groove for ease of installing
pin at a later time. Check wear between items 3 & 4
Figure 3-6.
2
1
3
4
5
6
7
8
9
ROTATION
ARROW
7
6
10
ROTATION
ARROW
Clockwise
Counterclockwise
1. Oil Pump & Bearing
Head
2. Relief Valve
3. Drive Segment
4. Five-Lobed Rotor
5. Four-Lobed Rotor
6. Eccentric
7. PIn
8. O-Ring
9. Cover
10. Vent Hole
Figure 3-6. Gear Oil Pump
7.
Insert drive segment and five-lobed rotor,
ensuring that the pins on the rotor are inserted into the
appropriate holes in the drive segment drive wheel.
8.
Install the four-lobed rotor inside the five-lobed
rotor, ensuring that the end with the counter bore is
installed toward the drive segment.
9.
Install the eccentric in direction indicated (CW
or CCW) as so desired so oil pump rotates in the same
direction as the crankshaft. The stamping in the eccentric
next to the pin shows the direction the pump will rotate,
as viewed from the crankshaft end of the compressor
.
10.
Install the pin in the shortest of the two grooves
inside the bearing head.
11. Install the O-ring and pump cover.
12. Install the relief valve assembly.
