MBW VS77M - Manual (Page 9)

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S
ERVICE
Assembly and disassembly should be performed by a
service technician who has been factory trained on MBW
equipment. The unit should be clean and free of debris.
Pressure washing before disassembly is recommended.
• Prior to assembly, wash all parts in a suitable cleaner or
solvent.
• Check moving parts for wear and failure. Refer to the
Replacement section in this manual for tolerance and
replacement cycles.
• All seals and bearings should be oiled prior to assembly.
Also, ensure that the seals are inserted square and are
seated properly.
• Leaking air caused by worn seals will decrease
performance of pole tamper.
General
The disassembly and assembly procedures given here are
intended for a complete dismantling of the MBW Vibration
Suppressor. Read the following sections carefully.
Vibration Suppressor Disassembly
Refer to Vibration Suppressor Assembly, page 10
1. Remove vibration suppressor from pole tamper.
2. Place the vibration suppressor in a vise and heat
main tube (#8) near end to loosen loctite. Using a pin
spanner wrench, unscrew bottom cap (#11) from
main tube. Use caution not to melt seals and wipers
inside bottom cap.
3. Slide entire assembly out of main tube.
4. Remove bottom cap (#11) from rod assembly (#16).
5. Heat main tube near top end to loosen loctite
securing top cap. Using wrench flats, remove the top
cap assembly.
6. If the spring (#2) is damaged, remove 2 screws (#15)
to release spring. These screws are secured with
high strength thread locker, heat before attempting
removal.
• Seal and wiper (#5 & #4) will become damaged if
removed from bottom cap (#11). Replace both items
when removed.
Vibration Suppressor Assembly
Refer to Vibration Suppressor Assembly, page 10
1. Thoroughly clean and inspect all components before
re-assembling. Replace any parts that are damaged
or worn.
2. Secure spring (#1) to cap (#11) with 2 screws (#15).
Use high strength thread locker and thread locker
primer.
3. If wiper and seal (#4 & #5) were removed, insert new
seal (#5) into middle groove of bottom cap (#13) and
wiper (#4) into bottom groove. The use of air tool oil
will aid assembly. Be careful not to excessively bend
or tear the components. See detail on Vibration
Suppressor Assembly, page 10 for item orientation.
4. Insert bearing (#6) into bottom cap.
5. Slide spring (#1) over rod (#16), wrap bearing (#6)
around puck and install into main tube (#8). Use a
light film of oil to aid installation.
6. Apply a light film of oil inside the end cap assembly
(#11). Slide the end cap over the rod assembly using
care not to cut the seal or wiper. Apply primer and
medium strength thread-locker to bottom cap threads
and screw into main tube (#8). Tighten cap using a
pin spanner wrench.
7. Apply primer and medium strength thread-locker to
the external threads on the top cap. Screw the top
cap (#9) into the main tube (#8). Tighten by using
wrench flats on cap.
8. Complete assembly by reinstall onto pole tamper.
Tamper Disassembly
Refer to Tamper Assembly, page 14.
1. Remove the connecting pipe or vibration suppressor,
if equipped, and set aside.
2. Remove the clamp screw (#40) with an impact
wrench and tap the tamper shoe off with a rubber
mallet.
3. Unscrew the back head (#16).
4. Disassemble the valve assembly(#23-25). Pull the
pin (#26) out with a twisting motion. Note the order
and position of parts to assure proper reassembly
later.
5. Remove the plunger (#30) through the top hole.
6. Pry the tab of the lock clip (#36) out and unscrew the
packing nut (#37).
7. Use the plunger (#30) as a ram to remove the
packing set (#33) and the guide bushings (#31 &
#35). Put a container under the body of the tool to
catch the parts as they may “pop” out.
8. To remove the muffler heat gently to make it more
pliable.