Page Number - 7
Cylinder Tube and Muffler
1. Remove Pump Stop Subassembly (See
previous instructions).
2. Remove two Screws (Item 30) with
3/16” hex wrench and remove Muffler
Assembly.
3. Remove Gasket (Items 28).
4. Remove four Nuts (Item 26) with open
end wrench.
5. Lift upward and remove Upper Casting
(Item 8).
6. Remove four Tie Rods (Item 25).
7. Remove Air Tube (Item 7).
8. Lift upward and remove Cylinder Tube
(Item 6).
9. Remove Piston and Piston Rod (Item 5).
10. Remove four Connecting Rods (Item 41)
with open end wrench.
11. To REASSEMBLE, REVERSE
procedure.
NOTE: Align two holes on the the
Cylinder Tube (Item 6) with two holes
on the Pump Stop Subassembly before
tightening Tie Rods (Item 25) so that
proper seal with O-rings is achieved.
Labyrinth Sub-Assembly
Disassembly Procedure:
1. Use 9/64" Allen wrench to remove four
screws (item 80) from the face of the
labyrinth sub-assembly to remove it
from the Pump Stop assembly.
2. Remove screw (item 88) using a #1
Phillips screwdriver to remove the
cover (item 87) over the selector knob.
3. Remove the selector bolt (item 86) and
washers (item 85) to remove the
selector knob. Use caution when
removing the selector knob from the
labyrinth assembly, a pin (item 82),
spring (item 83), and 7 balls (item 81)
are retained by the selector knob and
could be lost.
4. Remove gasket (item 74) from the
backside of the labyrinth sub-assembly.
5. Using a 9/64" Allen wrench remove six
screws (item 73) from the backside of
the labyrinth sub-assembly.
6. Separate the labyrinth sub-base (item
75) from the labyrinth cover (item 78)
exposing the labyrinth plate and gasket.
7. Remove the gasket (item 76) and plastic
laminated labyrinth (item 77).
8. Remove seven O-rings (item 79) from
the labyrinth cover (item 78).
Labyrinth Sub-Assembly
Re-assembly Procedure:
Re-assembly is basically the reverse of the
disassembly procedure with the
following precautions.
1. Insure that the plastic laminated
labyrinth (item 77) is in good condition
before re-assembly. The clear plastic
laminate should be in sound condition
without any tears or indications of
separation from the brass labyrinth
plate inside. Visually inspect the
labyrinth plate for any sighs of blockage
including, but not limited to, dirt, grease,
oil, or water, which should be visible
through the clear laminating material.
2. Keep all labyrinth components clean and
free of grease, oil, and dirt, except as
noted.
3. A very light coating of light grease may
be used to retain the balls (item 79) in
place when installing the selector knob
(item 84).
4. When reassembling the labyrinth
sandwich, install the six screws (item
73) but do not tighten. Install the
selector knob (item 84) and selector bolt
(item 86) before tightening the six
screws (item 73). Tighten the six
screws (item 73) to 12 in-lbs. Tighten
the selector bolt (item 86) to 50 in-lbs.
5. When installing the labyrinth sub-
assembly onto the Pump Stop assembly
use four screws (item 80) and tighten
to 12 in-lbs.
