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9X Series testers

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The motor runs but the tester does not move.  Rate it

The power screw is driven from the drive gear on top of the motor to the driven gear on top of the power nut. The power nut is an aluminum nut that the power screw passes through. First check drive gear on top of the motor. The drive gear is held to the motor shaft by a setscrew against the motor shaft. The setscrew can loosen and the drive gear will disengage from the driven screw. If this is the case turn the power off, move the drive gear to engage the driven gear and tighten the setscrew. If the gears are properly engaged, the threads in the aluminum power nut can wear out. Thread the power nut off the top end of the power screw and inspect it. On older 94 series and all 93 series the torque bar power screw and torque bar can jump if a large specimen breaks. This may disengage the drive and driven gears. Inspect and engage gears.

My 95 tester is starting to make noise.  Rate it

Check and lubricate the power screw and bearing between the pillow block and driven gear. Fina Marson Liplex ET NLGI #2 is the preferred lubricant. At the tester turn off the power and disconnect the power cord. Remove and inspect the motor brushes. The brushes are located at the bottom of the motor under plastic screw caps. It requires a flat blade screwdriver. Make sure the carbon brushes are equal length. Often removing and reinserting the brushes cures noise problems.

How can I check speed calibration?  Rate it

The speed is controlled by the motor controller in the test stand. If the speed display is not correct first clean the opto disk. To check speed measure the time it takes to travel a fixed distance. Distance / time = speed. If speed is not correct clean the opto reader with an air supply. Inspect the opto disk. Replace the opto disk then the opto reader.

My 94 or 95 series tester blows fuses.  Rate it

Remove the motor brushes. Inspect for wear and signs of oil. If the brushes are covered with oil the motor shaft seal is leaking. The motor must be replaced. If the motor brushes appear to be good the problem is most likely a failed motor power supply(SCR board). Contact Com-Ten Industries for replacement.

The motor runs erratically.  Rate it

Turn the power off at the tester. Disconnect the tester power cord from the power source. Remove the motor brushes. The brushes are located at the bottom of the motor. Remove the two plastic caps with a screwdriver on the right and left had sides of the motor. Inspect for even wear and the brushes are dry. If the brushes show signs of oil, the motor shaft seal at the gearbox is leaking. The motor must be replaced. If the brushes are worn to or past the minimum brush length indicator marked on the brushes, replace the brushes.

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