TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
Power head will not operate.
The power head is not plugged into the safety
foot switch.
Plug the power head into the safety foot
switch. Refer to the “Power Requirements”
section on page 7.
The rotation control switch is not set in
position.
Flip the rotation control switch to the desired
direction. Refer to the “Tool Operation” section,
starting on page 12
The circuit breaker has tripped or a fuse has
blown out in the electrical circuit that supplies
the power head.
Reset the breaker, or replace the fuse.
Power head turns the cut grooving tool
counterclockwise.
The rotation control switch is set to the wrong
position.
Flip the rotation control switch to the opposite
direction. Refer to the “Tool Operation” section,
starting on page 12.
Cut grooving tool does not make full contact
with the pipe end, or the cut grooving tool
“walks” off the pipe.
The cut grooving tool is being driven
counterclockwise.
Flip the rotation control switch to the
opposite direction to drive the cut grooving
tool CLOCKWISE. Refer to the “Tool Operation”
section, starting on page 12
The power mule is not positioned 90° to
the pipe.
Re-position the power mule to be 90° to the
pipe. Refer to Figure 1 on page 12 of the “Tool
Operation” section.
The pipe is not cut square.
Cut the pipe end squarely.
Cut grooving tool hits power mule as it rotates.
The power mule is not positioned 90° to
the pipe.
Re-position the power mule to be 90° to the
pipe. Refer to Figure 1 on page 12 of the “Tool
Operation” section.
Circuit breaker continuously trips or a fuse
repeatedly blows out in the electrical circuit
that supplies the power head.
The power mule is plugged into an undersized
circuit.
The power head shall be connected to a 20-
amp circuit by itself, or all other equipment on
the circuit shall be turned off while the power
mule is in use.
An extension cord that is too thin or tool long
is being used.
Replace the extension cord with the correct
thickness (gauge) and length. Refer to the
“Extension Cord Requirements” section on
page 7.
The power mule is not on its own dedicated
circuit.
The power head shall be connected to a 20-
amp circuit by itself, or all other equipment on
the circuit shall be turned off while the power
mule is in use.
The power head runs, but it does not drive the
cut grooving tool.
There is a mechanical problem with the
square-drive adapter.
Inspect the square-drive adapter for wear or a
broken lug. Replace the square-drive adapter,
if necessary.
Remove the square-drive adapter, and inspect
the power head drive pins for damage. Replace
the power head drive pins, if necessary.
TM-PMII_15
REV_C
TM-PMII
/ Operating and Maintenance Instructions Manual
