User`s manual

7. Maintenance and Repair

7.1 MAINTENANCE

Just like any rotating equipment, Magtrol dynamometers require periodic maintenance. It is recommended

that maintenance be performed every 5000 hours of normal operation. This corresponds to the theoretical

life of the bearings and the time after which Magtrol recommends their replacement. (Bearings should

be replaced as soon as they start showing signs of wear.) Higher wear occurs when the dynamometer is

operated outside its optimal working conditions. This is especially true when the dynamometer is operated

at excessive rotational speeds, which results in the generation of axial and radial forces on the bearings.

Various indicators alert the user as to when maintenance is required:

• The dynamometer can no longer reach its nominal torque (particularly true with magnetic

powder dynamometers)

• The water tubing is clogged causing a temperature rise

• The residual torque is out of speciﬁcation.

When the bearings generate noises, it indicates that maintenance is overdue. At this stage,

measurements have already been distorted and the entire dynamometer unit is subject to vibrations,

reducing its operating life.

7.2 REPAIR

In case of a defect, please refer to both the Warranty and Service Information located at the back of

this manual. Whether you are directed to ship your equipment back to Magtrol, Inc. in the United

States or Magtrol SA in Switzerland, it is very important to include the following information with

your return shipment:

• Model number, part number, serial number, order number and date of purchase

• Description of the defect and the conditions in which it appeared

• Description of the test bench (drawing, photographs, sketches, etc.)

• Description of the tested object (drawing, photographs, sketches, etc.)

• Description of the test cycle

7.3 SENDING EQUIPMENT TO MAGTROL FOR MAINTENANCE/REPAIR

Caution: maintenanCe must be performed by magtrol in order to guaranty

future measuring aCCuraCy. to allow magtrol to Complete the

work in the best possible time, follow the proCedure outlined

below as well as the proCedure outlined in the rear of this manual

under ServiCe information.

1. Do not

dismantle the dynamometer (so that Magtrol can test it prior to performing maintenance).

2. Lock the dynamometer for transport (see Section 2.1 – Locking the Dynamometer for

Transport).

3. Carefully pack the dynamometer.

4. The Magtrol DES Power Supply and TSC Torque/Speed Conditioner that is used with the

dynamometer should also be returned at this time for calibration.