MAC TOOLS AW434C-Serie Betriebshandbuch Seite 27

3. Apply a quality locking compound to the Reverse
Valve Knob Screw (17). Attach Reverse Valve Knob
(16) to Reverse Valve with the Reverse Valve Knob
Screw (17), and tighten Screw to 40 to 50 in–lb (4.5
to 5.6 Nm) torque.
Assembly of the Reverse Valve
1. Place Trigger (11) in Housing and secure it with
Trigger Pin (12).
2. Install Throttle Valve O–ring (7) on Throttle Valve
(6).
3. Install Throttle Valve Stem (9), Throttle Valve and
Throttle Valve Spring (8).
4. Install Air Strainer Assembly (10) and tighten it to
30 to 35 ft–lb (40.5 to 47.5 Nm) torque.
Assembly of the Reverse Valve
1. Using a sleeve that will contact only outer ring of
bearing, press Front Rotor Bearing (21) into Front
End Plate (26) and Rear Rotor Bearing (20) into Rear
End Plate (27).
2. Slip Front End Plate and Bearing over splined hub of
Rotor (19).
3. Grasp splined hub of Rotor in leather–covered or
copper–covered vise jaws so that Rotor is in a vertical
position.
4. Dampen each Vane (25) with light oil and insert a
Vane into each vane slot.
For proper performance, the Cylinder (23) must be
installed according to the following instructions:
5. One end of the Cylinder has a small dimple on the air
inlet. The end with the dimple on it must be installed
on the Front End Plate. See Dwg. TPA1778.
CYLINDER
DIMPLE
(THIS SIDE MUST BE
INSTALLED ON THE
FRONT END PLATE)
Set the Cylinder over the Rotor and onto the Front
End Plate.
6. Slide Rear End Plate and Bearing onto rotor hub and
against Cylinder.
7. Install Rear Rotor Bearing Retainer (22) in groove on
rotor hub.
8. Align dowel hole in both End Plates with the one
through Cylinder, and insert a guide rod 5/32"
diameter x 6" long (3.9 mm diameter x 152 mm
long). Allow rod to protrude from Rear End Plate.
9. Grasp handle of the Motor Housing in
leather–covered or copper–covered vise jaws so that
bore of the Motor Housing is horizontal.
MAINTENANCE SECTION
(Dwg. TPA1778)
27
10. Wipe a thin film of light grease on End Plate Gasket
(28) and press Gasket firmly against Rear End Plate.
11. Insert protruding end of guide rod into dowel hole in
bore of Motor Housing and slide motor along rod
until it is completely seated.
12. Remove guide rod and replace it with Cylinder Dowel
(24).
13. Reposition Motor Housing in vise so that open face of
Motor Housing is upward.
14. Place two Motor Clamp Washers (29), convex side
first, against Front End Plate so that inner rim of
leading Washer contacts End Plate, and outer rim of
trailing Washer contacts Hammer Case Pilot (36).
15. Place Rear Hammer Frame Washer (32) over hub of
Rotor and against Front Rotor Bearing.
Assembly of the Impact Mechanism
BOTTOM HAMMER
HALF–ROUND
NOTCH ON LEFT
1. Coat Hammers (33) with a light film of Mac Tool
Pneumatic Grease.
2. Replace Hammers in Hammer Frame (30) exactly as
they were when you marked them prior to
disassembly.
3. Replace Hammer Pins (31).
4. Examine base of Anvil (41) and note its contour.
While looking down through the Hammer Frame,
swing top Hammer to its full extreme one way or
another until you can match contour of Anvil. Enter
Anvil into Hammer Frame and through first Hammer.
Swing bottom Hammer in opposite direction from top
Hammer and maneuver Anvil slightly until it drops
into bottom Hammer.
Assembly of the Air Wrench
1. Set assembled impact mechanism down over splined
hub of Rotor.
2. Smear a thin film of Mac Tool Pneumatic Grease on
inside surface of Hammer Case Bushing (37), and
place the Hammer Case down over Anvil and against
Motor Housing.
3. Install Hammer Case Cap Screws (39). Tighten
Hammer Case Cap Screws to 110 to 120 in–lb (12.4 –
13.6 Nm).
TOP HAMMER
HALF–ROUND
NOTCH ON RIGHT
(Dwg. TPD1535)