30
Section 2 - Components
2.4 Ground Hog Control Systems
UHP water is supplied to the Ground Hog by a
high pressure pump. Controls for the pump and
engine are unique to the power system. All op-
erators should have a thorough understanding of
the power system and controls before operating
the equipment.
High pressure water to the spray bar is turned ON
and OFF by a lever on the Ground Hog handle. A
knob on the handle below the lever controls spray
bar rotation speed.
The lever simply closes the Dump Valve as it is
squeezed which causes all water to go through the
spray bar. If the nozzles are sized properly and
deliver a high cohesive stream of water, the pres-
sure will rise and cause the spray bar to rotate.
Spray bar rotation speed is controlled by open-
ing or closing the needle valve on the handle that
restricts hydraulic fluid flow. Rotate the valve
counterclockwise to open the valve and increase
rotation speed. Rotate the valve clockwise to close
the valve and decrease rotation speed or stop
spray bar rotation for testing purposes.
DANGER
NEvER uSE A STRAP, WIRE TIE OR ANY OTHER dEvICE
TO H O L d T H E G R O u N d H O G C O N T R O L L E v E R O N.
THE OPERATOR WILL NOT BE ABLE TO RELEASE THE
LEvER ANd STOP WATERBLASTING OPERATIONS IN
AN EMERGENCY WITH THE LEvER SECuREd IN THE ON
POSITION. THIS COuLd CAuSE THE OPERATOR TO LOSE
CONTROL OF THE GROuNd HOG ANd ALLOW THE HIGH
PRESSuRE WATER STREAM TO CONTACT THE OPERATOR’S
BOdY OR THE BOdY OF ANOTHER PERSON, RESuLTING IN
SERIOuS INJuRY OR dEATH.
NOTICE:
ALL OPERATORS ANd SuPPORT PERSONNEL SHOuLd
REAd THE MANuAL INCLudEd WITH THE uLTRA HIGH
PRESSuRE ANd vACuuM POWER SYSTEM TO MAKE
SuRE THEY uNdERSTANd THE SYSTEM IN THEORY ANd
OPERATION BEFORE OPERATING THE GROuNd HOG WITH
THE SYSTEM.
Ground Hog UHP/Dump Valve Control Lever & Spray Bar
Rotation Speed Control Needle Valve
DANGER
AvOId CONTACT WITH LEAKING WATER. WATER LEAKING
F R O M F I T T I N G S AT H I G H P R E S S u R E I S v E RY H O T.
SCALdING ANd SEvER BuRNS CAN OCCuR vERY quICKLY.
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