Troubleshooting
5-4
HP6A Manual
Symptom: Machine not stroking.
Possible Cause: Feed Ring not set correctly
If you are making a small adjustment to the Feed Ring it is important to back off the hand wheel
several notches (5 to 10) before pressing the Auto Cycle button again. The HP6A takes at least
two strokes to calculate the Strokes Per Minute and the load on the stones. If there is not enough
stoking time before the “0” on the feed ring is reached, the control does not have enough data to
calculate the correct stopping time for the hone head.
Possible Cause: Upper Stop Senor Adjustment
If the upper stop sensor is not reading the machine can stroke and then stop at the top of the
cylinder and not return towards the bottom. This can be intermittent. The hone head will
continue to rotate even after travel has stopped. Refer to the Upper Sensor adjustment in the
Maintenance section of this manual.
Possible Cause: Stroke Lever
Sometimes the stroking speed lever on the front right hand side of the spindle carriage has been
moved into the full upright position. This will not allow any hydraulic fluid to pass. Therefore, the
machine will not be able to stroke.
Possible Cause: Solenoid or Board Failure.
As with all electronic devices, solenoids will eventually fail. To determine if the solenoid is bad,
turn the spindle on and press the stroke button. Does the stroke button light up?
If not then the control panel should be replaced (514-7-54G page 6.11).
If the light does come on, but the rocker arm still does not stroke, leave the light on and locate the
stroking solenoids in the back of the carriage (514-2-70P & 514-2-70N page 6.17). There is a
small button on these solenoids so they can be manually activated. Use a small Allen wrench or
similar device to depress these buttons. The rocker arm should go down. If you release the
buttons the rocker arm should go back up. If the rocker arm does not go down when the buttons
are depressed check all air lines for kinks.
If the rocker arm goes down as stated, turn the machine power off, check all wiring at solenoids,
and in the rear enclosure. If the machine still does not stroke after checking the wiring, contact
the factory for possible solenoid or board replacement.
Possible Cause: Oiler tank empty
If the Oiler tank (located on the right hand side of the hone tank) goes dry the O-Rings in the
shifting spooler may go dry. Add oil to the oiler, turn the drops per minute way up and start the
machine stroking to re-lubricate the O-Rings. The Stroking may have to be activated by hand.
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