VTUFD10-15200 Diesel Troubleshooting
VTUFD10-15200 SUPPORT
V-TUF D10 Diesel — Troubleshooting
Fault-finding for the VTUFD10-15200 diesel pressure washer, taken from the operator manual. Work through the quick checks first, then find your symptom below.
200bar15L/minL100NYanmar 10 HP dieselXHDM400SSpump · 1450 rpmC0.081unloader
Safety first. Before any check: stop the engine, close the fuel tap and squeeze the trigger (pointing in a safe direction) to release the system pressure. Let hot parts cool. Repairs to the pump, unloader or engine should be carried out by a V-TUF approved technician.
Quick checks before you call
Water supply
- Supply between 1 bar and 8 bar
- Supply flow greater than 15 L/min
- Inlet filter P13.6511 clean
- No air leaks on the suction side
Pump
- Oil visible in the sight glass
- No milky (water-contaminated) oil
- Pump primed – air bled out
- Never run the pump dry
Engine
- Clean diesel in the tank
- Fuel tap on, throttle to maximum
- Engine oil level correct
- Battery charged (key start)
Lance & nozzle
- Correct nozzle fitted, not worn
- Couplings fully engaged
- Optiseals in place and undamaged
- Hose not kinked or damaged
Correct starting procedure
- Connect the water supply, then the high-pressure hose and trigger gun.
- Move the throttle lever to maximum and make sure the fuel tap is on.
- Open the pump priming / decompression valve.
- Pull start: pull gently until you feel resistance, move the decompression lever in the direction of the arrow, then pull the cord right out with a strong pull.
- Key start: move the decompression lever in the direction of the arrow, turn the key clockwise and release it when the engine starts.
- Run until a strong, constant stream of water comes from the priming valve, then close it.
- Operate the lance. If the jet is not smooth, turn the pressure & flow knob anticlockwise until the flow is smoothest.
Priming on suction
When drawing from a tank or bowser, disconnect the high-pressure hose and run the engine until a strong stream of water comes from the outlet. Stop the engine, reconnect the hose and restart with the pressure knob set to low.
Stopping
Throttle to minimum, close the fuel tap, then squeeze the trigger to release pressure before disconnecting couplings.
Find your fault
01The pump turns but does not reach the required pressure
| Possible cause | Solution |
|---|---|
| The pump is sucking in air | Check that the piping is watertight |
| Worn valves | Replace the valves |
| Worn valve seat | Replace the valve seat |
| Worn or incorrect nozzle | Replace the nozzle |
| Worn gaskets | Replace the gaskets |
| Dirty water filter | Clean the water filter |
02Irregular fluctuations in pressure
| Possible cause | Solution |
|---|---|
| Worn suction and/or delivery valves | Replace the valves |
| Foreign bodies in the valves | Check and clean |
| Air being sucked in | Check the piping |
| Worn gaskets | Replace the gaskets |
03Pressure surging
| Possible cause | Solution |
|---|---|
| Faulty unloader | Clean or replace the unloader |
Parts:Unloader C0.081N
04Drop in pressure
| Possible cause | Solution |
|---|---|
| Worn suction and/or delivery valves | Replace the valves |
| Foreign bodies in the valves | Check and clean |
| Air being sucked in | Check the piping |
| Worn gaskets | Replace the gaskets |
05Water in the pump oil
| Possible cause | Solution |
|---|---|
| Worn oil seal | Replace the oil seal |
| High air humidity | Change the oil twice as often as normally prescribed |
| Gaskets completely worn | Replace the gaskets |
06Excessive noise
| Possible cause | Solution |
|---|---|
| Air being sucked in | Check the seals in the tubing |
| Dirty water filter | Clean the water filter |
| Insufficient water supply | Ensure the water supply exceeds the pump flow rate |
| Worn or broken suction/delivery valve springs | Replace the valves |
| Foreign bodies in the suction/delivery valves | Check and clean the valves |
| Worn ball bearings | Replace the ball bearings |
| Water temperature too high | Lower the water temperature |
07Water leaking between pump body and pump head
| Possible cause | Solution |
|---|---|
| Worn gaskets | Replace the gaskets |
| Worn pistons | Replace the pistons |
| Worn piston O-ring | Replace the piston O-ring |
Parts:Seal kit VTPKIT28
08Oil leaking between pump body and pump head
| Possible cause | Solution |
|---|---|
| Worn oil seals | Replace the oil seals |
09Excessive vibration
| Possible cause | Solution |
|---|---|
| Worn or dirty valves | Clean or replace the valves |
Parts:Valve kit VTPKIT2
10The engine does not start
| Possible cause | Solution |
|---|---|
| No fuel in the tank | Fill the tank with clean diesel |
| Fuel tap closed | Turn the fuel tap on |
| Decompression lever not used | Move the decompression lever in the direction of the arrow before pulling the cord or turning the key |
| Flat battery (key start) | Charge or replace the 12 V battery and check the cable connections |
Pump oil: V-TUF Pressure Lube PL500 – fill the pump to halfway on the sight glass. Change after the first 50 hours, then every 500 hours. Change it twice as often in high humidity. Milky oil means water has got in – stop and have the seals checked.
Servicing
Bronze · VTUFD10-15200-BRZ
Self-service kit: 4× PL500, 5× SSQ seals, 5× MSQ seals, jets, air filter, suction filter.
Silver · VTUFD10-15200-SLV
Bronze contents plus VTPKIT28 seal kit and VTPKIT2 valve kit. Fitted by a V-TUF approved engineer.
Gold · VTUFD10-15200-GLD
Silver contents plus 3 hours labour by a V-TUF approved engineer.
Still having problems? Stop using the machine and contact us, quoting the model and serial number.
Call 01522 787978 or email enquiries@v-tuf.com
Call 01522 787978 or email enquiries@v-tuf.com