Section 7 Troubleshooting HP7A Manual
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7-1
Troubleshooting
The Following is a basic guide in trouble shooting the HP7A Honing machine.
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).
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). 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 Machine Parts section 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 Machine
Parts section 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) 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 Maintenance section 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 16th 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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