SECTION 6: MAINTENANCE
CAS40P 40 CFM / 100 PSIG
PAGE - 44
®
An Oshkosh Corporation Company
Removing and Replacing a Side Panel
to remove
the side panels.
Refer to
Figures 6-9
,
6-10
,
6-11
and
Section 6.4.13,
Disassembling the Compressor
when performing
piston ring maintenance.
There are two compression rings and one oil control
ring per piston. The compression rings are beveled
on their inside diameters, and must be installed with
the bevel on top of the piston ring groove.
The oil control ring has an expander that should be
placed behind the ring. To ensure that oil blow-by is
minimized, the piston ring gap on each ring is stag-
gered one from the other.
KEY
DESCRIPTION
QTY
A
ROD CAPSCREW
8
B
ROD LOCK WASHER
8
C
CONNECTING ROD
4
D
BEARING INSERT
4
E
NEEDLE BEARING WRIST PIN LP & HP
4
F
ROLL PIN
4
G
WRIST PIN LP
2
H
PISTON LP
2
J
I
OIL CONTROL RING LP
2
K
I
BOTTOM COMPRESSION RING LP
2
L
I
TOP COMPRESSION RING LP
2
M
PISTON HP
2
N
I
TOP COMPRESSION RING HP
2
P
I
BOTTOM COMPRESSION RING HP
2
Q
I
OIL CONTROL RING HP
2
R
WRIST PIN HP
2
I
This replacement part is found in the mainte-
nance kit; for maintenance on piston rings,
order kit no.
73744206
.
Figure 6-9: Piston Ring Maintenance
A
B
C
C
D
E
F
R
A
B
D
E
F
G
H
M
Q
P
N
L
K
J
Assembly Part
Kit Part: Piston Ring
Maintenance Kit
KEY
DESCRIPTION
A
COMPRESSION RING - INSIDE EDGE BEVEL
B
PISTON RING GROOVE
C
Bevel positioned on top, facing upwards
Figure 6-10: Compression Ring Bevel Position
C
A
B
KEY
DESCRIPTION
A
GAP-ALIGNED RING GAPS: May allow oil blow back
B
STAGGARED RING GAPS: Deter/minimize oil blow back
C
OIL BLOW BACK DIRECTION
Figure 6-11: Staggered Piston Ring
A
B
C
C
Manual #99905382 Rev 02
(JUNE 2018)
Summary of Contents for IMT CAS40P
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