Section 7 Troubleshooting HP7A Manual
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7-2
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 Machine
Parts section 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). 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 )
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.
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.
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