Hog Technologies SK5500, Operation Manual

Page: 70 / 161

70
Section 3 - Operation
3.6 Blasting Procedure
Overview
Before you start the job, you should evaluate the
pavement and the material to be removed. Choose
the appropriate spray bar and nozzles best suited
for the job. You should also consider the desired or
expected profile of the blasted surface in your selec -
tion. There are many variables that affect blasting
efficiency, productivity and the profile of the blasted
surface. As operators acquire experience, the selec-
tion process becomes more refined and easier. Refer
to the visual impact guide for additional information.
Generally, large, high volume (.013 - .015) nozzles
are the most aggressive and provide faster results.
However, they also provide greater potential for
damage and a course profile. Consequently, high
volume nozzles should be used only on strong
pavement (concrete or newer pavement). Small,
low volume (.007 - .011) nozzles are less aggres-
sive and will provide somewhat slower results but
provide less potential for damage and a smoother
profile. Low volume nozzles are well suited for
weak pavement (older or damaged pavement).
Low volume nozzles are typically a better choice for
inexperienced operators on any surface.
Hog Technologies offers an on-site training pro -
gram that dramatically reduces the learning curve
and increases productivity. If you are new to water
blasting, we highly recommend that you consider
this factory training for your operators. You can
also contact Hog Technologies Customer Service
department for assistance in choosing spray bars
and nozzles or more information regarding the fac-
tory training program.
CAUTION
THE PAVEMENT WILL BE DAMAGED IMMEDIATELY IF HIGH
PRESSURE BLASTING IS ACTIVATED WITHOUT THE HOG
HEAD MOVING. ALWAYS MAKE SURE TRUCK IS MOVING
BEFORE SUPPLYING HIGH PRESSURE TO THE BLAST HEAD.
CAUTION
WHEN THE BRAKE PEDAL IS PRESSED TO STOP THE
TRUCK WHILE IN WORK MODE, THE HYDROSTATIC DRIVE
IS DISENGAGED, BUT THE UHP PUMP CONTINUES TO
OPERATE AND WILL DAMAGE THE PAVEMENT. ALWAYS
TURN THE DUMP VALVE SWITCH OFF BEFORE STOPPING
THE TRUCK.
Before Blasting Operations Begin:
• Evaluate the Pavement and Select a Spray Bar.
• Strong pavement withstands high aggression
spray bars. This is generally concrete or new
asphalt.
• Cracked pavement is weak and will require a less
aggressive spray bars.
• Brittle pavement is a challenge and will require
less aggressive spray bars and reduced pressure.
• Consider spray bar width. Choose a spray bar
2” wider than the line being removed to provide
steering tolerance plus slight over spray to reduce
the potential for missed areas and need to back
up and re-do sections.
• Pre-clean the work area with a power broom if
necessary before blasting.
Hog Arm and Hog Head Operation
1. Activate Hydraulic System (refer to Section 3.4)
2. Make sure all switches and speed dials are in the
OFF position or set at 0.
3. Make sure the FLOAT SWITCH is OFF.
4.
Use the joystick in the control panel to raise the
arm and take the load off the lock pin.
5. Remove the pin then slowly lower the arm and
blasting head until the caster wheels are firmly
on the pavement.
6. Turn the FLOAT SWITCH ON to engage float mode.
Engaging The Waterblasting System
1. Activate Hydraulic and water blasting systems
(refer to Section 3.4)
2. Set the pressure (refer to Section 3.5)
3. Align the truck with the material to be re-
moved, stopping a short distance before the
start point for blasting operations.
4. Use the joystick controls to move the blast
head to the proper working position.
5. Set head speed to the desired RPM.
6. Select FWD on the FWD/REV switch and make
sure all personnel are clear.
7. Rotate the TRUCK SPEED dial to set the for-
ward speed to a speed slightly faster than the
estimated speed necessary to perform removal.