51
if necessary.
e. Replace thrust plate onto oil pump housing.
Be careful to align valve spring vertically over
the center of the valve discs. If not aligned
properly, the valve spring will damage the oil
pump housing upon fi nal torque of Allen screws.
Torque Allen screws.
f. Replace oil pump shaft O-ring and oil pump
housing O-ring.
g. Set the oil pump shaft so that the slot in the
shaft aligns with the drive pin in the crankshaft
when the oil pump is mounted to the bearing
carrier. Mount the oil pump to the carrier (aligned
with dowel pins) and install bolts. Torque to
appropriate level.
ALL BLOCKS:
3. Wrap all pressure fi ttings with fresh Tefl on tape
before reattaching.
4. Replace pressure gauge and loadless start unloader
(also constant speed unloader if furnished with your
machine).
‘B’ - ‘E’ and ‘V’ Blocks: Adjust oil pressure regulating
screw all the way in, and back out 1.5 turns.
5. Pressurize unloader assembly so the machine will
start without load.
6. Start the compressor paying close attention to oil
pressure. If pressure doesn’t rise to 20 PSIG for ‘B’
- ‘E’ and ‘V’ Blocks or 40-50 PSIG for F Blocks, within
thirty (30) seconds, shut the unit down and inspect
for leaks.
7. Check oil pressure when machine is hot to be
assured the pressure range is between 20 - 25
PSIG for ‘B’ - ‘E’ and ‘V’ Blocks, or 45-50 PSIG for
‘F’ Blocks. Adjust oil pressure as needed to obtain
proper operation.
BEARING REPLACEMENT
NOTICE: When replacing the bearings, the entire
bearing assembly including the cup and cone, must be
replaced, as well as the oil seal if applicable.
1. Follow steps 1-12 of the “Compressor Disassembly”
section.
2. Remove the flywheel and drive key from the
crankshaft.
3. Remove the oil pump and/or bearing carrier per the
“Oil Pump Replacement” section.
4. Remove the bearing cup from the bearing carrier
using a bearing puller.
5. Slide the crankshaft through the oil-pump end of
the crankcase. The bearing cones can be removed
from the crankshaft with a bearing puller.
6. Remove the bearing cover plate from the fl ywheel
end of the crankcase. The bearing cup is pressed into
the crankcase and must be removed with a bearing
puller. Remove all shims from the bearing cover plate
and crankcase.
7. Grease the outer edges of the new bearing cups.
Press the fl ywheel end bearing cup into the crankcase
with the large end of the taper away from you (towards
oil pump). Press until the cup is fl ush with the outside
of the crankcase. Press the oil pump end bearing
cup into the bearing carrier with the larger end of the
taper away from the bearing carrier (toward you) until
it stops.
8. Press the proper bearing cone onto each end of the
crankshaft with the larger end of the taper towards the
center of the crankshaft. The bearing races should rest
against the crankshaft shoulder. Lubricate the bearing
cones thoroughly with clean, high quality grease.
9. Install the crankshaft through the oil pump end of
the crankcase.
10. Install the bearing carrier onto the crankcase
with a new bearing carrier gasket. Tighten bolts to
specifi ed torque.
11. If the bearings have not been replaced, reinstall
the fl ywheel end bearing plate and the same shims. If
new bearings have been installed, use a thicker set of
shims. Torque the bearing cover plate bolts to proper
tightness.
12. Rotate the crankshaft by hand to be sure it is free
to spin. Verify the proper amount of end-play of the
crankshaft per Clearance tables. If necessary, remove
shims until end play is within tolerance.
13. If the crankshaft binds, or there is no end-play,
remove the bearing carrier, crankshaft and bearing
plate, and drive the fl ywheel end bearing cone slightly
farther out of the crankcase. Re-install the bearing
carrier and crankshaft, and put thicker shims in front
of the bearing plate. Replace the bearing plate and
torque to proper tightness. Repeat step 12-13 until
bearing play is within tolerance.
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