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PROCEDURE 2
PROCEDURE 2 - PREVENTIVE MAINTENANCE (continued)
P
R
TO PREVENT ELECTRICAL SHOCK, ALWAYS DIS-
E
CONNECT CONCENTRATOR FROM ELECTRICAL
V
OUTLET BEFORE SERVICING.
M
A
*
NOTE: This kit is designed for rebuilding the Tho-
I
mas Model 2638 or 2618. These compressors use
N
this rebuild kit. The serial number is located on the
T
front of the compressor. If the serial number does
E
not begin in this way, this kit will not work.
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The 3-Liter Thomas 2638 or 2618 Compressor
A
Rebuild Kit contains the following:
N
C
1. Two (2) Connecting (Piston) Rod Assemblies.
E
2. Two (2) Connecting Rod Screws.
3. Two (2) Aluminum Piston Sleeves.
4. Four (4) Valves.
5. Two (2) Valve Restraints.
6. Two (2) Head Gaskets.
3
7. Two (2) Valve Plate Gasket.
L
8. Two (2) Connecting Rod Screw.
T
9. Twelve (12) Head Mounting Screws.
R
10. Four (4) Valve Screws.
C
11. Four (4) Connector (Crossover) Tube "O" Rings.
O
12. Hernon # 846 Lubricant.
M
13. Hernon # 423 Threadlocker.
P
R
Tools Required:
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One (1) 1/8 and 5/32-inch Allen Wrench attachment.
B
Inch Pound Scale Torque Wrench.
U
One (1) Common (Flathead) Screwdriver.
I
One (1) Small Common (Flathead) Screwdriver.
L
One (1) Phillips Head Screwdriver.
D
Removing and Marking the Compressor Heads
and Replacing Crossover Tube "O" Rings
(FIGURE 6)
1. Unplug concentrator.
2. Carefully remove compressor from concentrator.
(Refer to PROCEDURE 7 - REPLACING
COMPRESSOR ASSEMBLY OR CAPACITOR).
3. Use the Phillips screwdriver to remove the twelve
(12) screws that secure the head assembly and
valve plates to the compressor.
4. Mark the heads and valve plates to ensure proper
reinstallation and set valve plates aside.
CAUTION
PREVENTIVE MAINTENANCE
5. Grasp both head assemblies and gently pull them
apart.
6. Remove the crossover tubes from the head as-
sembly.
NOTE: Replace all four (4) "O" rings.
7. Use a small flat screwdriver to get between the
edge of the "O" rings and grooves in the cross-
over tubes or roll the "O" rings out of the grooves
and remove from crossover tubes.
8. Slide NEW "O" rings into the grooves at each end
of the crossover tubes.
9. Gently reinstall the crossover tubes into the end
of one (1) compressor head.
10. Reinstall the remaining head onto the ends of the
crossover tubes.
Mounting (Phillips Head) Screws
(12)
Separate the Head
Assemblies
"O"
Ring
CROSSOVER TUBE
FIGURE 6 - REMOVING AND MARKING THE
COMPRESSOR HEADS AND REPLACING
CROSSOVER TUBE "O" RINGS
NOTE: After removing the head assembly, rein-
stall Valve Plate onto the side opposite the piston
being rebuilt. This restricts movement of the other
piston and prevents possible damage to the com-
ponents.
24
Mark the Head
Assemblies
Crossover Tubes
Groove
"O"
Ring
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