Invacare 6LXO2 Service Manual page 27

PREVENTIVE MAINTENANCE
PROCEDURE 2 - PREVENTIVE MAINTENANCE (continued)
Alignment of the Piston (FIGURE 8)
1. Hold sleeve down with one hand and slowly turn
eccentric with the other.
2. As the piston travels up and down, the connecting
rod will rock from front to back in normal opera-
tion.
3. If connecting rod rocks side to side, the rod is mis-
aligned on the eccentric bearing.
4. If this is evident, loosen set screw and repeat
STEPS 3-8 for INSTALLING THE PISTON.
5. If connecting rod cannot be properly aligned, con-
tact Invacare Technical Service.
6. Twist the aluminum sleeve back up onto the pis-
ton until sleeve is approximately centered on the
teflon ring of the piston.
7. With the aluminum sleeve firmly seated onto lo-
cator ribs, set the individual valve plate from that
side of the compressor onto the aluminum sleeve
and position it until the six (6) holes in the valve
plate line up with the six (6) holes in the top of the
compressor housing. This aligns the piston assem-
bly.
8. Securely tighten the connecting rod screw against
the flat spot on the nib (camshaft) (FIGURE 3).
CAUTION
Ensure that eccentric set screw is aligned with
the flat spot on the cam shaft. Failure to do so
may result in damage to compressor or possible
injury.
9. Reinstall the fan blade securely over the nib in
front of the eccentric (FIGURE 3).
10. Temporarily reinstall the valve plate for the piston
just replaced to simplify installation of the other
piston.
11. Begin at FIGURE 2 for installation of the new pis-
ton on the opposite side of the compressor.
Replacing the Top and Bottom Valves and
Gaskets (FIGURE 9)
NOTE: Ensure that when installing the new valves,
they are facing in the same direction that the old ones
were in when removed from each plate and that they
completely cover the compression opening in the valve
plate. Ensure that no dirt or grease contacts them as
this may inhibit their ability to open and close properly
and severely reduce the compressor's ability to ad-
equately compress air.
CAUTION
Because of tooling of the valve keepers, ensure
that the word "UP" on the valve keeper is facing
you when installing the valve keepers.
1. Replace the top and bottom valves by doing one
side of the valve plate at a time.
2. Use the small common (flathead) screwdriver to
remove the valve screws securing the valve, valve
keeper, and valve restraint to the valve plate.
3. Remove the valve keeper, and valve from the top
of the valve plate.
4. Remove the bottom valve screw, valve keeper strip
and valve from the bottom of the valve plate.
5. Remove the old gasket from the valve plate.
6. Reverse STEPS 1-5 to install the NEW valves and
gasket onto the valve plate.
7. Remove the old gasket in the head assembly and
install the new gasket in the compressor head and
the valve plate gasket into the underside of the
valve plate.
NOTE: DO NOT attempt to reinstall the head assem-
bly at this time.
8. After the other piston and valves have been re-
placed, install the valve plates over the aluminum
sleeves ensuring that the valve keeper strip fits
into the cut-out in the top of the piston.
NOTE: Ensure that the gaskets are not pinched or out
of position when reinstalling the valve plates and the
head assembly. Doing this will prevent leaks and
lowsystem pressures.
9. Reinstall the head assembly onto the valve plates
noting the markings made when the head assem-
bly and valve plates were removed.
10. Tighten the screws in a criss-cross manner and
torque to 45 in. lbs.
11. Reinstall the compressor.
12. Run unit and check for leaks around compressor
hoses and crossover tubes.
13. If crossover tube(s) leak, gently rotate the tube(s)
approximately 1/4-turn. Once "O" ring(s) seat
themselves, leaks should stop. If not, contact In-
vacare Technical Service at the number on back
page of this instruction sheet.
27
PROCEDURE 2
P
R
E
V
M
A
I
N
T
E
N
A
N
C
E
3
L
T
R
C
O
M
P
R
E
B
U
I
L
D