51
Section 4 - Maintenance
High Pressure Hoses
4.8 High Pressure Hose Installation
The ultra-high pressure hoses should be inspected
weekly or every 50 hours and replaced as re-
quired. Use the following procedure when replac-
ing a pressure hose.
When replacing damaged or worn high pressure
hoses, check the burst rating marked on the hose.
Always use a replacement hose with an equal or
greater pressure rating.
Replacing a high pressure hose from the
power system to the Ground Hog:
1. Make sure the water blasting system is shut-
down with the power system in the service
position.
2. To avoid contamination that could clog nozzles,
always make sure hose fittings and the area
around the hose connections are thoroughly
cleaned.
3. Remove the old high pressure hose and cap
the fittings to prevent contamination.
4. If the hose to be replaced is routed through
a tight area, use the 7/8” hose coupler fitting
in the Spare Parts System and attach an end
of the new hose to the fitting on the old hose.
Cap the other fitting on the new hose to pre
-
vent contamination, then carefully pull the old
hose out while guiding the new hose into place.
5. If the new hose will be routed on its own and
not pulled through by the old hose, cap both
ends to prevent contamination and carefully
route the hose into position.
6. Verify the routing of the hose, making sure it
is not in contact with sharp edges or near a
source of heat that could damage the hose.
Install anti-chaffing or heat deflectors to pro
-
tect the hose if necessary.
7. Remove the caps and apply a light coat of
anti-seize to the threads of each fitting. Then
attach the fittings and tighten to specifications.
8. Follow the steps in the Startup Procedure to
purge the UHP hose at low pressure to remove
debris that could have entered the system
while changing the hose.
9. Shutdown the water blasting system and re-
turn the power system to the service position.
10. Install the protective cap on the power system
UHP hose fitting to prevent contamination until
it is connected to the Ground Hog.
NOTICE:
G R O u N d H O G H I G H P R E S S u R E H O S E S M u S T B E
PROTECTEd WITH ANTI-CHAFFING.
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