PG 8
Troubleshooting
!!Warning!! Before attempting any repairs or maintenance, make sure machine is shut off. For electric start units, disconnect
battery cables. Severe injury can occur due to electrical shock.
Problem
CAUSE
REPAIR
Pump Malfunction And Pressure Delivery Problems
Low Pressure
Worn or oversized nozzle
Replace worn nozzle
Check nozzle size
Clogged water and/or chemical inlet strainer
Clean or replace strainers
Worn or damaged plunger seals
Replace plunger seals
Worn or damaged inlet or discharge valve
Replace worn valve poppets or valve springs
Dirt or foreign particles in valve assembly
Remove any dirt or particles
Air leak in inlet plumbing or discharge
Locate air leak. Reseal connection or replace
damaged port
Rough operation with
loss of pressure
Restricted inlet plumbing, or air leak in inlet
plumbing
Repair clogged inlet fittings. Check supply hose
and ensure adequate water supply
Damaged plunger seal or pump valve
Replace any damaged pump parts and clean
out any foreign particles
Clogged nozzles
Clean or replace nozzles
Water leakage at intake
manifold or crankcase
Worn manifold seals, plungers, O-rings or
condensation inside crankcase
Replace seals, sleeves, or O-rings. Change oil at
regular interval
Inadequate water supply to pump creating a
vacuum lock
Ensure adequate tap water supply; clear inlet
filter
Oil leaks
Worn pistons and/or leaking crank seals,
crankcase cover seal or drain plug seal
Replace seals, sleeves or O-rings
Excessive wear
Worn and loose bearings
Replace bearings. Check bearing seals, spacers,
and retainers. Replace any worn parts.
Short plunger seal
Abrasive particles in fluid being pumped
Replace water and chemical strainers if
damaged or missing. Install additional filter
if fine abrasives are still evident
Operator(s) running pump without water
supply
DO NOT ALLOW UNIT TO RUN WITHOUT
ADEQUATE WATER SUPPLY
Hot water in pump
Do not run in bypass for more than 2 min.
Do not let water supply exceed 140° F
Irregular Spray pattern
Worn or partially clogged nozzle
Clean or replace nozzle
Unloader Valve Malfunction
Unloader cycles
Fitting leaking downstream
Tighten/replace fitting
Clogged nozzle
Clean or replace
Fluid leaking from body
O-ring worn or cut
Replace part as necessary
Unloader will not turn up
to pressure
Foreign particle in valve
Replace or clean
Nozzle worn or sized incorrectly
Replace part as necessary
Plunger or valve worn
Replace part as necessary
Extreme pressure spikes
Adjusting nut turned completely into unloader
Loosen adjusting nut
Clogged nozzle
Clean or replace
MyTana MV84 DUAL CART JET TER User Manual