Section 7 Troubleshooting HP7A Manual
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7-5
Possible Cause: Oiler tank empty
If the Oiler 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.
Uncontrollable Stroking Speed.
Possible Cause: Air in the Hydraulic System
If there is allot of air in the hydraulic system, it will become compressed as the machine changes
directions. If the air is becoming compressed the hydraulic uid is not forced to go through the speed
control ball valve, thus the rocker arm speed is uncontrollable. Take the precision head off of the
machine, set the stroke length to its maximum travel, set the stroke speed to slow. This will allow the
air to compress and then start forcing the hydraulic uid through the speed control valve. The Rocker
arm will be erratic at the top and the bottom of the stroke but this will conrm that there is air in the
Hydraulic system.
Possible Cause: Check Valve Failed
The Check Valve (514-7-58) coming off of the bottom of the Reservoir may have failed.
Possible Cause: Hot Oil Shuttle may have failed.
To determine if this is the cause, watch the Reservoir while the machine is stroking. If there is excess
uid owing into the reservoir from the top, the Hot Oil Shuttle relief valve has failed or is not adjusted
correctly. If the relief valve has not been adjusted by your personnel, this is not the cause.
Banging at Top of Stroke.
Possible Cause: Upper Sensor has moved.
It is possible the upper sensor has moved from its factory position. Refer to Upper Limit Switch
Adjustment in the Maintenance section of this manual for the proper factory setting.
Possible Cause: Improper Stroking Speed for length of cylinder being honed.
Correct stroking speed can be calculated. Refer to Stroking Speed in the Operating Instructions
chapter in this manual.
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