All-Power APW5120, Owner'S Manual, Page: 8 / 13

14
Owner’s Manual
Trouble Shooting
• Engine wil not start or stops while operating.
Low-oil shutdown: Fill engine with oil
Engine switch not in “ON” position: Turn switch “ON”S
Pressure built up in hose: Squeeze trigger while starting
• Engine is overloaded
Nozzle partially blocked Clean Nozzle
Excessive pressure Shorten the spring coil on the reflux valve
• Pressure increases when gun is locked
Bypass valve blocking Clean the bypass valve
• Engine is running but pump won’t build maximum pressure or has irregular pressure
Faucet closed Open faucet
Unit has been stored in freezing temp. Thaw out unit completely
Inadequate water supply Provide a minimum of 4 GPM at 20 PSI
Water inlet screen clogged Clean screen
Kink in garden hose Straighten garden hose
Wand nozzle worn or damaged Replace nozzle
Air in pump Run with gun open & wand removed
until steady stream of water is released
Adjustable pressure knob not set Set to maximum position
to maximum position
Suction or discharge valves clogged Clean the suction or discharge valves
or worn out
Bypass valve not operating effectively Clean the bypass valve
• No intake of chemicals
Injection tube not securely inserted Push firmly into injector
into unit
Tube cracked or split Replace tube
Wrong nozzle Switch to low pressure nozzle
Injector turned off Turn collar counter
• Trigger will not move
Gun safety lock engaged Release safety lock
15
Owner’s Manual
Trouble Shooting
• Water in crankcase
High humidity Change oil more frequently
Worn seals Change the oil seals
• Noisy operation
Worn bearings Change the bearings
Air mixed with water Check inlet lines for restrictions
and / or proper sizing
• Rough / pulsating, operating with pressure drop
Inlet restriction Check system for stoppages, air leaks,
correctly sized inlet plumbing to pump
Unloader Check unloader for proper operation
Air mix in water Check inlet lines for restrictions and or
proper sizing
• High crankcase temperatures
Wrong grade of oil Use recommended oil
Improper amount of
oil in crankcase Adjust oil to proper amount