DISASSEMBLY
STEP 1.
Clean loose dirt from the outside
of the compressor.
STEP 2.
Loosen the 4 head screws (1)
and remove the compressor head (2).
STEP 3.
Carefully remove the valve plate
(4) from the bottom of the head.
STEP 4.
Remove the head gasket O-ring
(3) and discard. Turn the valve plate over.
Remove the cylinder sleeve O-ring and
discard.
STEP 5.
Remove the slotted screw on
the top of the valve plate and discard.
Remove the valve keeper and valve
flapper and discard.
2
3
STEP 6.
Remove the 4 screws (A) secur-
ing the front cover (Figure 2). Remove the
front cover (B) and discard old front cover
gasket (C).
STEP 7.
Remove the plastic ratchet (D)
securing the foam filter (E). Remove filter
and discard. Set the ratchet aside for as-
sembly later.
STEP 8.
Rotate the eccentric bearing
assembly so that the hex head of the set
screw is facing the side of the housing
you just removed the filter from. Place
the 5/16” allen wrench in the vent hole
and loosen the set screw and slide the
Connecting Rod Assembly off of the shaft.
Remove it through the top of the housing
and discard.
2
4
3
Figure 1
1
Place allen
wrench here
A
B
C
D
E
Figure 2
REASSEMBLY
STEP 9.
Clean the top of the valve plate with a
clean, soft cloth. Install the new exhaust valve
flapper (curl facing down). The valve keeper
should be placed on top of the flapper so that
the word “UP” is visible.
NOTE:
Torque flapper screw to 18 inch-
pounds.
STEP 10.
Install the new head gasket, seating
it firmly into the groove with your finger or blunt
object. (See Fig. #3). Set aside.
STEP 11.
Insert new rod assembly through top
of housing (same as removal). Align set screw
on eccentric bearing with the flat of the shaft (ec
-
centric toward housing). Push assembly onto the
shaft until the eccentric touches the housing.
STEP 12
. Temporarily place the valve plate as-
sembly on the compressor housing so the lip of
the cylinder sleeve fits into the O-ring on the
bottom of the valve plate assembly. Position the
valve plate so the mounting holes line up with
the threaded holes in the housing. Temporarily
insert two head screws into the mounting holes
to secure the valve plate assembly.
NOTE: The purpose of this procedure is to cor-
rectly position the connecting rod assembly on the
the motor shaft before tighting the set screw.
STEP 13.
Use a torque wrench to tighten the ec-
centric set screw to 55 inch-pounds. Remove the
valve plate assembly and head screws.
Figure 3
CHECK OPERATION: Hold the sleeve down against the housing with one hand, and
slowly rotate the motor shaft with the other hand to ensure all components are lined up
properly. As the piston travels up and down it will also rock from side to side. This is a
feature of the WOB-L Piston.
If the piston rocks from the back to the front, re-align
the eccentric bearing on the shaft.
STEP 14.
Place the head gasket into the groove located on the bottom on the head. Place
head on flat surface upside down.
STEP 15.
Place the valve plate on the bottom of the head with exhaust valve flapper
down. Place o-ring into groove on bottom of valve plate.
STEP 16.
Turn head and valve plate assembly right side up and place on top of housing
locating the o-ring onto the top of the cylinder sleeve. Tighten the 4 head screws to 40
inch-pounds.
Figure 4
