PISTON AS 1655809 - Caterpillar

Plug/Wire Protection Cover
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Plug/Wire Protection Cover
Table 8
Plug/Wire Protection Cover Checklist
Check For: OK - Use Again Not OK-Replace
Damage None Cover is smashed.
Scratches Cover is scratched None
Corrosion Cover is corroded(1) None
(1) Clean and paint to use again.Grommet
Illustration 11 g01141555Illustration 11 shows the grommet that prevents contamination from getting into sensor area.
Table 9
Plug/Wire Protection Cover Checklist
Check For: OK - Use Again Not OK-Replace
Cracks Not cracked or split Grommet is cracked or split
Deformity Not deformed Grommet is deformed.
Hard or Brittle Not brittle or hard Grommet is hard or brittle.
Seal(1) Seal is OK Seal is not tight.
(1) Check for tight seal between grommet and cylinder housing and between grommet and wires.Sensor Seal – O – ring
Illustration 12 g01141573
Sensor seal-o-ring
Caterpillar recommends that the seal-O-ring is replaced every time the sensor is removed.Sensor Backup Ring
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Back up ring
Caterpillar recommends that the backup ring is replaced every time the sensor is removed.Mounting Plate
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Mounting plate
If the plate is damaged to a point where the plate will not allow a clean seal to the cylinder housing, replace the plate.If the plate is only scratched, use the plate again.Clean the plate and use the plate again if there is corrosion on the plate.Note: This plate is often hard to get off due to the glue that is used on the backside during installation.Electrical Inspection
Sensor Signal
To measure the sensor signal, use a multimeter with a 10V power supply (a 9-12V battery can also be used). Use the voltage reading to determine the following:Replace the sensor if the signal goes high and stays high 5V.Replace the sensor if the signal output is intermittent.Replace the sensor is the signal is 0V.Duty Cycle
Duty Cycle is a ratio of pulse width to the time between pulses. The pulse wave is a square wave instead of a curved wave. The duty cycle reading will be a whole number 0 – 100 which corresponds to a percent.To test for the duty cycle, use a multimeter and a 10V power supply. Connect the 10V power supply to the orange wire and connect the multimeter to the white wire. The black wire is the ground wire. With the sensor out of the cylinder, place a magnet in the middle of the pressure pipe. The percent duty cycle reading should be within the 5-50% range. Also the percent duty cycle should increase as the magnet is slid along the pressure pipe away from the sensor housing.Note: A 9-12V battery can also be used.Replace the sensor if the percent duty cycle is not within the 5-50% range when the magnet is in the middle of the pressure pipe.Replace the sensor if the percent duty cycle does not increase as the magnet is slid along the pressure pipe away from the sensor housing.Resistance Check
Measure the pin to pin resistance with a multimeter set on the ohms setting.Do not apply a power supply voltage or battery to any pin.Replace the sensor if the resistance between any two of the three pins is less than 100,000 ohms (100K ohms)Frequency Check
To check the frequency of the sensor,