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Inspection and Repair
When using any solvent to clean parts, make sure that it meets
current safety and health standards and that it is used in an area
that is adequately ventilated.
1.
Clean all parts in a suitable solvent.
2.
All parts in the Housing (11), including the Valve Chest (8) and
Assembly
1.
If it was removed, reassemble the steel retaining lever:
a.
Insert the Spring (23) then the Plunger (24) into the
Fronthead (20).
b.
Fit the Lever (22) to the fronthead, then secure the lever with
the Pins (25, 26).
Clamp the housing firmly but carefully. The housing can be
cracked if the vise is over tightened.
2. Secure the Housing (11) in a vise with soft jaws. Position the
Housing with the handle up.
3. Check the Housing Bore to make sure it is clean. If necessary, use
a clean soft rag to wipe out any dirt or chips.
4. Drop the Piston (17) into the Housing (11) [Shank end towards
the fronthead end].
5. Install a new O-ring (36) on the Valve Cover (10).
6. Install a new O-ring (36) on the Valve Chest (8).
7. Install the Valve Cover (10) and Valve (9) into the Housing Bore.
8. Use a piece of 1/2-13 UNC-2B threaded rod to screw into the
top of the Valve Chest (8). Hold the end of the rod and install the
Valve Chest into the Housing Bore, being careful that it doesn't
get cocked.
9. Install the three Washers (4) as shown in the Figure.
Valve Chest Washer
Before installing the housing plug, make sure the valve parts
are properly assembled in the housing. If they are misaligned,
they may be permanently damaged and the Paving Breaker will
not run.
10. Install a new O-ring (7) in its groove in the Housing Plug (37).
11. Install a new O-ring (39) on the Oiler Plate (6).
12. Install the Oiler Plate (6) into the Housing Plug (37).
13. Install the Housing Plug (37) in the Housing. Using the Throttle
Lever (2), tighten the plug until the Plug fully collapses the three
Washers, then loosen 1/8 to 1/2 turn until the slot in the plug
allows assembly of the Throttle Lever.
Performance Testing
A reconditioned Paving Breaker should be tested before it is sent
back to the job. Before connecting the air hose, check to see that the
lubricator used with the breaker is filled with the proper lubricating
oil. Refer to Product Information Manual 51956043, for the correct
lubricating oil specifications.
With the breaker against the work surface, the breaker should
start with less than 20 psi (1.4 bar) air pressure and with the Piston
reciprocating smoothly. Let the breaker run in slowly at reduced
pressure long enough to see that it is in good working order. If the
breaker stalls, turn off the air immediately. Stalling indicates
binding caused by tight fits. After a short period of operation, a
51990497_ed4
WARNING
CAUTION
CAUTION
Valve Cover (10) must be examined, and all dust or dirt particles
removed.Check the valve (9) for cracks or chipping. If damaged,
replace it.
3.
Replace the Piston (17) when a .007 in. (.178mm) Feeler Gauge
can be inserted between the Piston and the Housing Bore.
4.
Check the Throttle Valve (32) and O-ring (33) for wear, and make
certain that the Throttle Pin (34) is free to slide in the handle.
14. Position the Throttle Lever (2) in the Housing Plug (37) Slot, and
drive in the two roll pins (3, 5) through the Housing and Throttle
Lever to secure.
15. If the filter was damaged, the Oiler Plate (6) must be replaced.
16. Install Oiler fill Plug (40) into the top of the Housing Plug (37).
17. Loosen the vise and position the Paving Breaker so the air
connection parts can be easily installed.
18. Insert the Throttle Pin (34), Throttle Valve (32), and Throttle
Spring (31) into the Housing (11).
The Throttle Pin must move freely in its Bore.
19. Install a new O-ring (30) into the groove on the Air Connection
Cap (29).
20. Install a new O-ring (28) in the groove on the Air Connection (27)
and install the Air Connection through the Air Connection
Cap (29). Secure the air connection parts with the air connection
cap.
21. If the Fronthead Bushing (21) was removed from the
Fronthead (20), an assembly tool should be made from and old
moil point to assist in reassembling the bushing in the Fronthead.
Refer to Step 13 for instructions on fabricating this tool.
Make sure the bushing is aligned in the Fronthead so that chisel
points, asphalt cutters, and other bladed tools will have the
blade parallel to the Paving Breaker T-handle.
The fronthead assembly is a tight fit in the Housing Bore. It may
be necessary to drive a wedge into the housing slot to open the
Housing Bore enough to allow the Fronthead assembly to be
easily replaced.
22. Using the fabricated assembly tool, press the Fronthead
Bushing (21) into the front end (steel end) of the Fronthead (20)
until bottomed.
23. Install the Fronthead (20) into Housing (11) with the steel retainer
latch on the same side as the Air Connection. Line up the slot in
the Fronthead with Hole in the Housing. Insert Bolt (18),
Washer (35) and Nut (19). Lubricate the Bolt Threads and
torque the bolt to 280 lb-ft (380 Mm).
24. If removed, install the Muffler.
definite rhythm should develop and an even exhaust note will be
heard. The breaker may become warm, but should not overheat.
If erratic operation continues or stalling persists, disassemble the
breaker and check for binding of parts.
After an initial period of low pressure operation, check the
performance of a reconditioned breaker with that of a new one
by comparing both under similar conditions and with normal air
pressure. Once testing is completed, place plastic Caps or Plugs in all
parts to keep out dirt until the breaker is put back into service.
NOTICE
NOTICE
3
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