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Scheduled Maintenance
5.16 Hydraulic System
Scheduled Maintenance
Hydraulic System
The hydraulic pump operates at very high pressure
and has specic maintenance requirements. You
should perform all recommended maintenance ac-
cording to the pump manufacturers’ specications.
Hydraulic uid should be changed and the tank
flushed on a regular schedule in accordance
with Waterblasting and the hydraulic component
manufacture’s recommendations. Hog Technolo-
gies recommends changing the uid at least once
every 600 hours.
Daily Inspection and Maintenance
• Check the hydraulic uid level each day or
immediately following the repair of a blown
hose, leaking tting or any hydraulic system
service.
• Inspect all hoses, ttings, valves and seals for
leaks and proper operation. Repair or replace
leaking or malfunctioning components before
operating the system.
• Check the pressure indicator on the high pres-
sure lter and make sure it is well within the
green zone. Change the lter cartridge when
the indicator moves near or into the red zone.
• Monitor the cooling fan operation and make
sure it is activating when necessary, sounds
normal and pulls a strong ow of air through
the cooler.
Refer to the Maintenance Matrix in this section for
uid specications.
200 Hour Inspection and Maintenance
• Change the low pressure lter in the return
line at the hydraulic oil reservoir ll cap. The
lter removes any debris that may enter the
system and should be changed every 200
hours or more frequently if necessary.
• Inspect the cooling ns for the oil cooler and
clean as necessary. The cooler is critical in
maintaining acceptable oil temperatures in
the hydraulic system and must be kept clean
to maintain eciency.
600 Hour Inspection and Maintenance
• Drain hydraulic uid and ush hydraulic tank.
5.17 Changing Hydraulic Fluid
& Flushing Tank
The reservoir tank is equipped with a removable
clean out and inspection plate near the bottom of
the tank. When the uid is changed, the clean out
plate should be removed to inspect the tank and
remove any sludge or debris accumulated on the
bottom. It also provides access to the strainers
on the supply tubes. Only qualied service techni-
cians should drain and ush the system or replace
hydraulic uid lters.
ALWAYS DEPRESSURIZE THE HYDRAULIC SYSTEM BEFORE
REMOVING ANY HYDRAULIC COMPONENTS, HOSES OR
FITTINGS. FAILURE TO DO SO COULD RESULT IN SERIOUS
INJURY OR DEATH.
NOTICE:
• BEFORE PERFORMING ANY MAINTENANCE PROCEDURE,
MAKE SURE THE WATERBLASTING SYSTEM IS
SHUTDOWN WITH THE TRUCK IN THE SERVICE POSITION
AND ON LEVEL GROUND.
• MAKE SURE THE HYDRAULIC TANK, FILTERS AND ALL
RELATED COMPONENTS ARE THOROUGHLY CLEANED
BEFORE SERVICING TO PREVENT CONTAMINATION.
• MAKE SURE ALL PARTS ARE CLEAN BEFORE FINAL
ASSEMBLY.
Drain & Flush the hydraulic tank and replace
the pick tube lter:
1. Make sure the hydraulic system is not pressur-
ized and the uid is cool.
1. Remove the ll cap to allow air to enter the tank
as the uid drains.
2. Drain the tank into a suitable container by re-
moving drain plug at the bottom of the tank.
3. When the tank is drained, loosen the bolt in the
center of the inspection plate and remove the
plate. Use a bright light to inspect for sludge
buildup and other contamination.
4. Remove sludge and contaminates, then ush the
tank until it is clean using fresh hydraulic uid.
5. Clean the screens on the pickup tubes.
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