20
MAINTENANCE SECTION
7. Using a pin punch, tap out the Throttle Valve Retain-
ing Pin (14) to release the Throttle Valve from the
Throttle Valve Bushing.
8. Remove the Throttle Valve Face (12) from the
annular groove at the end of the Throttle Valve.
9. Unscrew and remove the Inlet Bushing (2), Exhaust
Deflector Retaining Rings (3B) and Exhaust Deflec-
tor (3A).
10. If your tool is equipped with a built–in muffler, lift
off the Exhaust Deflector (22) and Deflector Gasket
(23). Using an awl, remove the Exhaust Silencer (24)
from the handle.
ASSEMBLY
General Instructions
1. Always press on the inner ring of a ball type bearing
when installing the bearing on a shaft.
2. Always press on the outer ring of a ball type bearing
when pressing the bearing 1nto a bearing recess.
3. Whenever grasping a tool or part in a vise, always use
leather–covered or copper–covered vise jaws.
Take extra care with threaded parts and housings.
4. Always clean every part, and wipe every part with a
thin film of oil before installation.
5. Always apply O–ring lubricant to O–rings before
assembly.
Assembly of Reverse Valve, Throttle and Inlet for
1702SB1
1. Install new Silencers (6A) in the Motor Housing (1).
2. Install a new Power Regulator Seal (11) in the groove
closest to the knurled knob on the Power Regulator
(10). Place the Detent Spring (13) and Detent Ball
(14) in the shallow hole in the hexagon flange of the
Swivel Inlet Body (7) and insert the Power Regulator
Assembly into the Swivel Inlet Body from the
hexagon flange end.
3. Align the groove on the end of the Regulator Shaft
with the through hole in the Swivel Inlet Body and
insert the Regulator Retainer (12). The Regulator
will turn firmly but freely within the Body when
properly assembled.
4. Place a new Swivel Inlet Seal (9) in each counterbore
in the Swivel Inlet (8) and slide the Inlet over the
threaded end of the Swivel Inlet Body.
5. Install a new Throttle Valve Face (3) in the groove on
the Throttle Valve (2) and insert the assembled
Throttle Valve, stem first, into the tapped hole in the
Motor Housing (1).
6. Next, insert the Throttle Valve Spring (4) into the
tapped hole in the Housing and retain the Throttle
parts with the–Swivel Inlet. Install the Inlet
Assembly Spacer (6B) between the Motor Housing
and the Swivel Inlet. Thread the Inlet into the tapped
hole clockwise and tighten between 23 and 27 ft–lb
(31.2 and 36.6 Nm) torque.
7. Align the holes in the Throttle Lever (5) with the
holes in the boss on top of the Motor Housing and
press the Throttle Lever Pin (6) into the through hole.
Depress the Throttle Lever several times to check
freeness of movement.
8. Insert a new Bushing Seal (18) into the undercut
inside the reverse valve bushing, making certain it is
firmly seated.
9. Install a new Reverse Valve Seal (16) in the groove
closest to the hexagon end on the Reverse Valve (15).
When installing the Valve, rotate the Valve back
and forth slowly, being careful not to damage the
Seals when inserting the Valve in the bushing.
Coat the Reverse Valve with a small amount of the
recommended oil and insert the tapered end of the
Valve into the Housing bushing from left to right
when facing the rear of the tool until the tapered end
of the Valve protrudes from the right side of the
Housing.
10. Apply a suitable thread–locking compound to the first
two or three threads of the Reverse Valve Stop (17)
and thread the Stop into the tapped end of the Re-
verse Valve. Tighten the Stop between 4 and 7 in–lb
(.5 and .8 Nm) torque.
Assembly of Reverse Valve, Throttle and Inlet for
1702P1
1. Install two Reverse Valve O–rings (5) in the undercut
at each end of the reverse valve bushing.
In this step, install the Reverse Valve from left to
right while facing the rear of the tool.
2. Install the Detent Ball Spring (7) and Detent Ball (6)
in the Reverse Valve (4) and while sliding the Re-
verse Valve into the reverse valve bushing, compress
the Spring and Ball until they seat in the bushing.
3. Insert the Knob Screw (9) through the Reverse Valve
Knob (8). Apply Loctite No. 242 to the first two or
three threads of the Screw and thread the Screw into
the tapped end of the Reverse Valve. While holding
the serrated end of the Reverse Valve with pliers,
tighten the Screw between 8 and 15 in–lb
(.9 and 1.7 Nm) torque.
4. Install a new Throttle Valve Face (12) in the annular
groove at the end of the Throttle Valve (11).
5. Install a new Large Bushing O–ring (16) and a new
Small Bushing O–ring (17) into their respective
grooves of the Throttle Valve Bushing (15). Seat the
other new Small Bushing O–ring (17) into the recess
of the Motor Housing.
