168
Troubleshooting
PROBLEM
CAUSE AND SOLUTION
UHP Pump & High Pressure System
Water Leaks.
• Hose tting indicator port leaking – tting loose.
Tighten tting or replace hose and tting
• Fluid end manifold leaking at rectangular hole in
manifold block – Stung box seal is worn out.
Replace stung box ring seal.
• Fluid end manifold leaking at round hole on top
of manifold block – Valve seals worn. Replace
valve seal or valve
• Weep holes dripping at high pressure hose
connection on thru-shaft motor – Loose swivel
nut. Hand tighten swivel nut.
• Leaking swivel seal. Remove spent seal, check
shaft nipple, clean thoroughly and replace with
new seal.
• Cracked swivel or thru-shaft. Remove shaft
assembly and disassemble to inspect shaft and
replace if damaged or cracked on nipple end.
Low inlet pressure of 30 PSI or less.
• Dirty Filters. Change lter bag and cartridge.
• Low or no inlet water pressure. Fill tank with
water.
• Empty Water Tank. Fill tank with water.
• Clogged impeller on pump. Disassemble pump
face and clean impeller or replace with a new
impeller.
• Cracked water line allowing air to be sucked in.
Check and nd any leaks and repair.
• Low voltage (electric) or hydraulic uid ow to
charge water pump. Be sure batteries on pump
or truck are charged or check hydraulic uid
level and ow.
• Debris in water line from tank. Flush or replace
with new line.
Low outlet pressure.
• Insucient engine RPM. Raise rpm of engine.
• Warn or blown nozzles. Change nozzles.
• Oversized nozzles. Refer to chart to correct
nozzle pattern.
• Leaks – hoses, ttings, nozzles, pump valves or
seals. Tighten or replace, check valves for heat
indicating internal bypass.
• Worn or missing button seal between spray bar
and shaft. Replace with new button seal.
• Air lock in fluid end. Remove rupture disc
assembly or side port tting, engage pump
and run up to high rpm to remove air from the
manifold.
• Low inlet water pressure. Change dirty water
lters - cartridge & bag.
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