IPA Tools 9005A Super MUTT Head - Manual (Page 9)

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4. TO FIND STICKY OR BAD BRAKE SERVOS: To check the mechanical servo
operation, slowly turn the PSI up and note the point at which both servos engage.
Then reduce PSI and note the point at which the servos release. They should
engage and release together at the same time.
To check for a leaking servo, you can charge Service Side and close ball valve
on the Emergency Side. There should be no increase in PSI on the Emergency
Side. Then reverse procedure and charge the Emergency Side and close ball
valve on the Service Side. No air should leak into the Service Side.
NOTE: Be certain to CHOCK ALL TRAILER WHEELS before conducting
trailer testing.
CHOOSING A BATTERY
(Manufacturer’s Suggested Replacement: YUSA #YTX14 or Equivalent)
• Battery Voltage: 12/24 V DC
• Battery Type: Lead Acid
• Battery Compartment Dimensions: 5 7/8” L x 5 3/4” H x 3 3/8” W
• Battery Protection: Inline 30 amp Fuse for Overcharge
INSTALLING AN INTERNAL BATTERY:
1. Remove the four 8-32 x 1/4” Phillips head screws in the back of the MUTT ® .
2. Slide out the battery tray.
3. Place the battery into the tray with the battery terminals facing the front of the
unit. Attach the ring terminal on the red wire to the positive side of the battery and
tighten securely.
4. Cover positive terminal with the red boot.
5. Attach the ring terminal of the black wire to the negative battery terminal.
6. Carefully slide the tray into the tester. Use caution - DO NOT ALLOW the
positive battery terminal to contact the unit.
7. Reinstall screws to secure.
AVOID MISDIAGNOSIS
• Before attaching to the trailer connector, make sure all sockets and pins are clean
and tight.
• Any loose or corroded connections may cause a misdiagnosis or show a fault.
• Use a well-charged battery.