Hog Technologies SK5500, Operation Manual

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Section 4 - General Maintenance
4.7 Dirt Shield Replacement
The dirt shield should be inspected daily to ensure
it is tightened properly and that the brush is in
good condition.
Use the following procedure to replace a dam -
aged or worn felt seal:
1. Make sure the water blasting system is shut-
down and the truck is in the service position.
2. Press and hold the lock button at the base of the
motor to hold the thru-shaft so it won’t turn.
3. Turn the spray bar counterclockwise by hand
until it is free of the shaft.
4. Remove brass button.
5. Use a stainless steel wire brush to clean dirt
from the thru-shaft threads.
6. Press the lock button and remove the dirt shield
by turning it counterclockwise.
7. Remove the felt seal. Then clean the dirt shield
and shroud.
8. Place a new felt seal on the dirt shield and
apply a light coating of anti-sieze to the thru-
shaft threads.
9. Press the lock button to hold the thru-shaft
and install the new dirt shield. Hand tighten.
NOTICE:
ONLY HAND TIGHTEN THE DIRT SHIELD. NEVER USE TOOLS
TO TIGHTEN THE DIRT SHIELD. IF THE DIRT SHIELD IS
TIGHTENED MORE THAN HAND TIGHT IT WILL CAUSE THE
SPRAY BAR TO ROTATE SLOWLY OR NOT AT ALL.
10. Reactivate the water blasting system by follow-
ing the steps in the Start Up Procedure.
11. Purge the blast head at low pressure to remove
debris that could clog the nozzles.
12. Shutdown the water blasting system and return
the truck to the service position.
13. Install a new brass button seal, hold the lock
button and reinstall the spray bar.
14. Hand tighten the spray bar by turning it clock-
wise slowly until it stops. Then seat the seal
by turning the spray bar another 15%. Make
sure the lock button releases the thru-shaft
when installation is complete.
15. Install the spray bar protector.
Dirt Shield
Button Seal
Apply Anti-Seize
Brass Dirt Shield & Felt Seal
Typical Dirt Shield Installation
Spray Bar Motor Thru-Shaft Lock Button