Troubleshooting
5-2
HP6A Manual
Possible Cause: Ratchet Actuator Assembly not adjusted properly.
The Ratchet Actuator Assembly is located on the rear of the main gearbox (514-6-22A). See
(page 6.6) of this manual for location of this assembly.
Air from the feed solenoid is sent to this assembly when a feed is required. The air moves the
piston inside this assembly, which in turn activates a pawl (514-7-29 see page 6.18). The pawl is
the mechanism, which feeds out the gearbox.
If the Actuator Assembly is not adjusted correctly (left to right), then the head will not feed out
under load. The actuator housing has four (4) slotted mounting holes in it. Loosen the four bolts
in the mounting holes and move the Actuator housing to the left (as you are facing the front of the
machine) by 1/32” at a time. After making an adjustment tighten the housing down again and try
the feed system. Continue adjusting the box and testing until the head will feed out under load.
( Also see Adjusting Feed Out Actuator Housing in the maintenance section of this manual )
Symptom: Hone Head continues to feed out without reaching preset load setting.
Possible Cause: Sheared roll pin in hone head assembly or in gearbox.
Determine location of sheared pin by removing hone head assembly from drive tube. Place hone
head in cylinder and feed out stones by hand by turning drive coupling until stones make contact
with cylinder wall. Use a wrench to tighten stones further. If stones can’t be tightened to lock up,
then sheared pin is located in hone head assembly. If stones lock up, the sheared pin is located
in the gearbox.
Symptom: Taper or bore not straight.
There are several items in the honing procedure, that if not followed properly will cause the
cylinder not to be straight. This could be taper, bowed out in the middle, or too big at the top.
Any one, or combination of the causes listed below could cause the problem. It is very important
to follow all steps of the honing process correctly. If you are in doubt of the correct process,
contact your area representative or the factory for assistance.
Possible Cause: Incorrect Over stroke settings.
If the over stroke (length the stones extend out of the hole at the top and bottom) is set too long,
the bore will end up being bigger in the area where the over stroke is not set correctly.
If the over stroke is set too short, that part of the cylinder will end up being small (taper). On
some blocks it is not possible to get the correct amount of over stroke set on the bottom of the
cylinder due to interference with the main webs. When this is the case, the dwell button can be
used to straighten out the cylinder.
NOTE: Upper and Lower stops settings are very important when honing. Incorrect stop
settings can cause the operator to think he needs to dwell the cylinder when that is not the
case. Excessive dwelling can cause the stones to become tapered. If this happens it
compounds the problem of taper in the cylinder.
Possible Cause: Tapered Stones.
If your over stroke is set correctly use a micrometer to measure the stones. When measuring the
stones, measure the top of one stone to the top of the stone across from it. Record this reading
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