Truckmount Troubleshooting
Identify and solve technical issues
Quickly diagnose and resolve issues with your Prochem or Sapphire truckmount. Select your model in the pull-down menu to access the relevant troubleshooting guide.
2018 Peak 500 Troubleshooting Tips
Water supply is turned off or the float valve is stuck or improperly adjusted.
Water supply is turned off or the float valve is stuck or improperly adjusted.
Debris clogging water lines or water inlet disconnect.
Clean or replace as needed.
Solution pump inlet supply line is plugged or drawing air.
Examine the water inlet strainer inside the water box. Remove accumulated debris and replace if required. Check for suction leaks and loose clamps or fittings. Tighten any loose fittings or clamps. Replace any ruptured hose(s).
Improper engine speed.
Using a tachometer, check the engine speed. Full throttle engine speed is 2950 ±50 RPM. Idle engine speed is 1450 ±50 RPM.
Improper engine speed (diesel).
Using a tachometer, check the engine speed. Full throttle engine speed is 2650 RPM. Idle engine speed is 1300 RPM. Refer to the "Engine Speed" section for instructions on how to re-adjust.
Pressure regulator O-rings are dry and/or worn.
Check O-rings. Replace if needed, or lubricate with O-ring lubricant.
Pressure regulator is dirty, stuck open, or improperly adjusted.
Clean or repair regulator. Adjust to working pressure. Lubricate O-rings, using O-ring lubricant.
Low pump volume. (Measure the amount of water being returned to the water box from the pressure regulator. It should fill a gallon container about every 17 seconds).
Examine the check valves, plunger cups, and cylinder head on the solution pump. Repair, whenever required (refer to the solution pump service manual).
Defective solution pressure gauge.
Replace gauge.
Orifice (spray nozzle) in the cleaning tool is worn, defective, or wrong size.
Replace nozzle or change nozzle size.
Belts loose or broken.
Re-tension or replace as needed.
Loss of pump prime.
Manually prime solution pump.
Plugged orifice and/or screen in the cleaning tool.
Unplug or replace orifice and/or screen.
Internal block between the pressure regulator manifold and the solution manifold, or the solution screen is clogged.
Inspect all lines, remove accumulated debris which is blocking proper flow. Replace any defective hoses. Remove, inspect, and clean the solution screen. De-scale unit and install a water softener, if necessary.
Outlet check valve is plugged.
Examine the check valve, remove any debris
Defective quick-connect on one or more of the solution pressure hoses.
Replace defective quick-connect(s) on solution pressure hose(s).
Cleaning tool valve is malfunctioning.
Repair or replace valve.
Hose inner lining is constricted.
Remove restriction or replace hose.
Air leak in chemical supply line, priming valve or metering valve.
heck for air leaks. Replace faulty parts.
Solution pump circuit breaker has been tripped. Take to dealer for diagnostics and repair.
Check the solution pump circuit breaker on the control panel. Press the circuit breaker reset button.
Defective electrical connection in the console wiring or defective switch. Dealer servicing required.
Examine switch, electrical connections, and wiring. Repair any defective connections. If there is power going to the switch but not going out, replace the defective switch.
Pressure pump has not been activated.
Turn solution pump switch to on.
Defective solution pump clutch.
If there is power in the switch, but not power at the clutch, replace the defective wire. If there is power at the clutch, replace the defective clutch.
Loose or broken solution pump belt. Dealer servicing required.
Tighten or replace belt.
Vacuum gauge is giving an improper reading.
Examine the tubing between the vacuum relief valve and the vacuum gauge and remove any blockage. Replace gauge if necessary.
Vacuum hose(s) is damaged, causing a suction leak.
Inspect hose(s), repair or replace.
Waste tank gaskets not sealing properly, not positioned properly.
Inspect the gaskets. Repair or replace as necessary. Re-position lid, inlet and outlet
Plugged vacuum hose or vacuum plumbing between vacuum inlet and strainer basket.
Unplug vacuum hose or inlet plumbing.
Waste tank filter or strainer basket is plugged.
Clean or replace filter. Clean strainer basket.
Loose vacuum pump drive belts.
Tighten the drive belts. Dealer servicing required.
Waste tank drain valve is damaged or left open, causing a vacuum leak.
Close drain valve, if open. Remove the drain valve and, after inspecting, replace the defective components.
Vacuum relief valve requires adjustment or has a vacuum leak due to damaged diaphragm.
Re-adjust the vacuum relief valve. If the vacuum does not increase, remove and inspect the relief valve diaphragm. If damaged, replace. Dealer servicing required.
Vacuum exhaust heat exchangers are plugged with lint.
Remove and clean.
Vacuum pump is worn out.
Replace the vacuum pump.
Improper throttle adjustment.
Adjust throttle to set desired vacuum pressure.
Vacuum relief valve requires adjustment.
Readjust the vacuum relief valve to 13" Hg.
Chemical pump is improperly primed.
Refer to chemical pump priming instructions.
Air leak in chemical supply tube, priming valve or metering valve.
Check for air leaks. Replace faulty parts.
The strainer at the inlet end of the chemical inlet tube is clogged
Unclog the strainer. If damaged, replace.
Suction leak in the inlet tube leading into the chemical pump.
Inspect inlet tube and flow meter for damage and replace, if required.
Chemical pump check valve(s) is clogged.
Remove any debris from the chemical check valve(s). Replace chemical check valve(s) or seals, if necessary.
Chemical prime/on-off valve or chemical metering valve is defective.
Replace valve(s).
Chemical pump diaphragm is ruptured.
Disassemble the chemical pump and replace the damaged diaphragm and plastic disk. Check downstream components for pieces of the diaphragm clogging the chemical flow.
Defective cylinder in the solution pump.
Measure the pump volume. If the pump volume is less than normal, refer to "Loss of Pump Volume" in the Troubleshooting section in this manual.
External leak in chemical piping.
Tighten fittings. Re-apply thread sealant where required. If any fittings are damaged, replace.
Outlet check valve is full of debris or damaged, not allowing it to close properly
Close the chemical valve on the chemical panel. If the flow meter does not indicate flow, remove debris or replace check valve, if necessary.
Chemical pump diaphragm is ruptured.
Close the chemical valve on the chemical panel. If the flow meter still indicates flow, replace the chemical pump diaphragm and plastic disk. Check downstream components for pieces of the diaphragm clogging the chemical flow.
Internal leak in chemical valve causing continual flow through prime tube returning to waste tank.
Tighten valve packing nut (see "General Service Adjustments" section in this manual). Replace valve, if necessary.
Main circuit breaker on the control panel has been tripped.
After inspecting the unit to determine the cause of the tripped circuit breaker, press the reset button.
Loose or corroded battery.
Clean, tighten, or replace the battery terminals.
Dead battery.
Recharge or replace battery.
Defective ignition switch.
Test ignition switch for power going into the switch. If there is power going in but NO power going out, replace the switch.
Defective starter motor.
Test the starter motor. If necessary replace.
Vacuum pump seized.
Refer to vacuum pump manufacturer manual or dealer.
Recovery tank is full.
Empty the waste tank.
Defective fuel pump. Dealer service required.
Replace the fuel pump.
Loose or broken wires leading to waste tank float switch.
Repair or replace any broken electrical connections.
Defective float switch inside recovery tank.
Check switch for proper operation, replace as necessary.
Engine is malfunctioning.
Refer to engine Owner's Manual.
Engine is out of fuel
Add fuel to the fuel tank.
Waste tank is full.
Empty waste tank.
Main or engine circuit breaker on the control panel has been tripped. Take to dealer.
After inspecting the unit to determine the cause of the tripped circuit breaker, press the reset button.
Defective 245°–255°F engine coolant high-temperature shutdown switch. Dealer servicing required.
Determine the cause of the overheating before restarting the unit. Refer to the Kubota Engine Operation and Maintenance Manual.
Defective fuel pump.
Replace fuel pump.
Defective float switch inside the waste tank.
Check switch for proper operation. Replace as necessary.
No ignition in the engine or engine is malfunctioning.
Refer to the engine owner's manual.
Flow restriction caused by hard water scaling.
Descale unit, repair or replace damaged plumbing components as necessary. Install water softener.
Not enough water flow during normal operation.
Check jet size of tool. Do not let cleaning tool sit for long periods with unit running. Trigger tool more often.
Thermal relief valve stuck.
Check thermal relief valve for scaling or debris.
Bypass manifold orifice clogged.
Clean orifice.
Water is dripping from the exhaust port due to condensation build-up.
NOTE: The heat exchanger may produce water condensation discharge at times during normal operation. Do not confuse this with a leak.
Heat exchanger is damaged from frozen water.
Inspect heat exchanger for leaks. Visually inspect for damage. Pressure check after removing the unit (maximum test pressure – 1500 PSI).
No vacuum hose is connected.
Connect vacuum hose to vacuum inlet port.
Temperature relief valve on water box is stuck open.
Clean temperature relief valve and test. Replace if necessary.
Engine RPM is low.
Reset engine RPM.
Defective temperature gauge.
Test gauge and sensor. Replace failed component.
Manual inlet bypass valve open.
Close valve, check for leaks. Replace if leaking.
Defective waste pump float switch.
Replace float switch.
Inspect check valve for debris or damage.
Clean or replace if necessary. Ensure that check valves are seated correctly by extending the spring.
Broken diaphragm.
Replace diaphragm.
Weak battery.
Charge or replace battery if needed. Check charging station.
Pump-out circuit breaker on control panel has been tripped. Take to the dealer.
After inspecting waste pump to determine the cause of the tripped circuit breaker, press the reset button.