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Troubleshooting - Clutch Does Not Engage
STEP 1: Ensure that the pressure control knob (POT) is in the maximum (CW) position.
STEP 2: Remove the clutch and electrical box covers.
STEP 3: Check all electrical connections between the engine magneto, sensor, control board and
clutch for loose connections or damaged leads.
STEP 4: Disconnect the two leads from the control board (blue) and the clutch assembly (black).
Using a multimeter, with the engine at maximum RPM, pressure control knob in the maximum
position and the prime valve open (priming) position, test the DC voltage across the boards leads
(blue). This voltage must be 13-14 VDC. If the readings are correct, the board, sensor and magneto
are okay and the problem is the clutch assembly. If this is the case, proceed to Step 5. If the voltage is
outside this range go to Step 7.
STEP 5: Check the spacing between the clutch eld and plate. The gap should be .010” to .014”. If
the gap is greater than .014” the gap is too wide. If this gap is too wide, replace the clutch assembly.
STEP 6: When the DC voltage from the board is not 13-14 VDC, disconnect the control board lead
(black) from the engine magneto lead (pink), located on the side of the engine. With the engine at
maximum RPM (3600), pressure control knob in maximum (CW) position and prime valve open
(priming), read the AC voltage from the magneto lead to the sprayer frame. This reading should be
19-24 VAC. If outside this range, contact your local Honda repair facility for magneto replacement. If
the magneto is producing the proper AC voltage, continue to Step 7.
STEP 7: Test the sensor by reading the resistance between the red and black wires. The resistance
runs between 1.5-3K ohms. A defective sensor usually shows no resistance (open). If the reading is
outside standards, replace the sensor. An alternative method to test the sensor, is to plug a new sensor
into the board and see if the clutch will engage. Caution! When using this method, ensure prime/
pressure valve is in the prime position. This is important because the sensor plugged into the board is
not measuring pressure in the uid section.
STEP 8: When Steps 6 & 7 have been completed and the magneto and sensor check good, the
electrical control board is the only item left, replace the board.
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