POWERHANDLING PowerHandler A Series, Assembly, Operation, Safety And Maintenance Manual, Page: 13 / 21

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13 of 21 Sept/20
Trouble Shooting Guide
The Drive Roller turns unengaged but won’t move the load
Determine whether the issue is:
A) TORQUE (drive roller stops turning when engaged with the load) or
B) GRIP or TRACTION (drive roller spins against the load, not moving it),
… and then read the appropriate suggestions for that problem below.
A) TORQUE - The drive roller stops turning when it engages with the
load
This is typically because of insufficient torque being provided to the drive roller and can occur for a
number of reasons.

Check the unloaded rpm of the motor and compare to what it should be (see below). On air
machines power is represented by both torque and speed so an underperforming machine
will turn more slowly, even unloaded.

For additional information on checking the RPM of your machine please see PowerHandling
RPM Test Procedure RPM/RM1.
A25 speed should be 84 rpm.
A30 speed should be 62 rpm.
A40 speed should be 57 rpm.
A60 speed should be 34 rpm.
T40 speed should be 39 rpm.

If the rpm for your model is within 5% of the number shown above the machine should be
performing (i.e. be capable of moving and/or lifting the loads) as per the Data Sheet. If not,
please contact your PowerHandling representative to investigate further.

If the rpm for your model is more than 5% under the number shown above then please
progress through the following trouble-shooting suggestions:
1. The drive roller urethane may have delaminated (i.e. separated) from the drive roll core.
This would give the impression the drive roll is not turning when in fact the core is, but
the polyurethane that should be bonded to it has separated and is not turning with it.
Look at the side of the machine to see if the drive roller core is turning while the
urethane surface is not.
2. The air lines and/or air connectors are not large enough size.
3. The air pressure and/or volume of the air supply are not great enough.
4. The vanes on the motor are blocked by debris or they are too dry.
5. The rotor of the motor has rusted or is otherwise scarred or damaged.