Troubleshooting
5-1
HP6A Manual
Chapter 5 Troubleshooting:
The Following is a basic guide in trouble shooting the HP6A Honing machine.
Symptom: Hone head will not feed out.
Possible Cause: Air not getting to the Ratchet Actuator Assembly.
The Ratchet Actuator Assembly is located on the rear of the main gearbox (514-6-22A). See
(page 6.18) of this manual for location of this assembly.
If the hand wheel on the gearbox does not try to feed out, then the Actuator assembly may not be
getting air from the Feed Out solenoid. Locate the feed out solenoid in the rear of the spindle
carriage (514-2-70H page 6.17). There is a small button on this solenoid so it can be manually
activated. Using a small Allen wrench or similar device to depress this button and see if the head
feeds out.
If the head feeds out when manually activated, then the solenoid may have gone bad, a wiring
connection has broken loose, or the machine is not seeing the strokes. The machine will not feed
out if it is not seeing the strokes. Verify that the machine is seeing the stroke by changing the
speed of the strokes, and the stroke speed display should change as you are changing the
speed. Turn the machine power off, and check the wiring on the solenoid by removing the wire
cap. Check all wire connections in the rear enclosure. If the head still does not feed, contact the
factory for solenoid or possible board replacement.
If the head does not feed out when you activate the solenoid manually, then you may not be
getting air to the solenoid. Check the incoming air supply and verify there is air to the solenoid
pack.
Possible Cause: Precision Hone head assembly dirty.
If the precision hone head assembly is not kept clean and free of rust, the head may not feed out
properly.
See (page 7.15) of this manual for disassembly of the precision hone head. Pay particular
attention to the threads on the cone (524-9-7A). If they are not clean and free of rust, the feed of
the head will not operate properly.
When the head has been thoroughly cleaned, re-assemble and test.
Possible Cause: Drag Pin tension on Ratchet Actuator Assembly not set correctly.
The Ratchet Actuator Assembly is located on the rear of the main gearbox (514-6-22A). See
(page 6.13) of this manual for location of this assembly.
When the head is not feeding out correctly, put pressure with your thumb on the shifting spool
(514-7-26 Page 6.18) where it exits the housing on the left hand side. If the machine starts
feeding correctly with pressure applied, then the drag pin tension is too light.
Refer to (page 6.18) of this manual for the location of the drag pin. Loosen the locking set screw
on the rear of the housing to allow the drag pin to be adjusted. Turn the drag pin counter-
clockwise only a 16
th
of a turn at a time, and test the feed. Do not over tighten the drag pin
tensioner. ( Also see Adjusting Drag Pin Tension in maintenance section of this manual. )
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