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PREVENTIVE MAINTENANCE
PROCEDURE 2 - PREVENTIVE MAINTENANCE (continued)
CAUTION
TO PREVENT ELECTRICAL SHOCK, ALWAYS
DISCONNECT
CONCENTRATOR
ELECTRICAL OUTLET BEFORE SERVICING.
Compressor Top End Rebuild - 5 Liter
*
NOTE: This kit is designed for rebuilding the Tho-
mas Model 2639 or 2619. These compressors use
this rebuild kit. The serial number is located on the
front of the compressor. If the serial number does
not begin in this way, this kit will not work.
The 5-Liter Thomas 2639 or 2619 Compressor
Rebuild Kit contains the following:
1. Two (2) Teflon Piston Rings
2. Two (2) Aluminum Piston Sleeves
3. Four (4) Valves
4. Four (4) Valve Restraints
5. Two (2) Head Gaskets
6. Two (2) Valve Plate Gaskets
7. Eight (8) Head Mounting Screws
8. Four (4) Valve Screws
9. Four (4) Connector (Crossover) Tube "O" Rings
Tools Required:
One (1) Phillips Head TORX T-25 Driver.
One (1) Phillips #2 Screwdriver Attachment for
Torque Wrench (for Retainer Screws).
One (1) 1/8-inch Allen Wrench attachment for
Torque Wrench (for Eccentric Set Screw).
One (1) 5/32-inch Allen Wrench attachment for
Torque Wrench (for Rod Clamping Screw).
One (1) Common (Flathead) Screwdriver attach-
ment (for Valve Screw).
Removing and Marking the Compressor Heads
and Replacing Crossover Tube "O" Rings
(FIGURE 10)
1. Unplug concentrator.
2. Carefully remove compressor from concentra-
tor. (Refer to PROCEDURE 7 - REPLACING
COMPRESSOR ASSEMBLY OR CAPACITOR).
3. Use the TORX T-25 torque wrench to remove the
eight (8) 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.
5. Grasp both head assemblies and gently pull them
apart.
6. Remove the crossover tubes from the head as-
sembly.
FROM
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 and remove "O" rings 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.
Head Mounting
(TORX) Screws
(8)
Separate the Head
"O"
Ring
FIGURE 10 - REMOVING AND MARKING THE
COMPRESSOR HEADS AND REPLACING
CROSSOVER TUBE "O" RINGS
NOTE: After removing the head assembly, rein-
stall Flapper Plate onto the side opposite the
piston being rebuilt. This restricts movement of
the other piston and possible damage to the
components.
DO NOT lubricate or use oil on any moving parts.
The compressor eccentric uses a precision
sealed bearing.
29
PROCEDURE 2
Crossover Tubes
Assemblies
Groove
CROSSOVER TUBE
WARNING
P
R
E
V
M
A
I
N
T
E
N
A
N
C
E
5
L
T
Mark the Head
R
Assemblies
C
O
M
P
R
E
B
U
I
L
D
"O"
Ring
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