Dynojet 248: Maintenance Guide - Manual (Page 32)

Maintenance Guide for Automotive Dynamometers
A U T O D Y N O M A I N T E N A N C E
Model 248 Dynos
28
C HECKING THE 248 D RUM B RAKE S HOE C LEARANCE
The 248 drum brake shoe clearance needs to be checked once per month. Use the
following steps.
1
Remove the air from the system.
1a
Shut off or disconnect the air supply to the dyno, and follow lock out
procedure.
1b Press the red button on the pendant to activate the drum brakes; the button
will be lit.
1c Press and hold the dyno in or out movement switch until you cannot hear
any air going through the movement motor.
Note: If there is no 4WD dyno, skip this step.
1d Using the red button on the pendant, cycle the drum brakes on and off
several times until no air is heard.
2 Remove the covers as necessary to provide safe working access to the dyno.
3 Measure the gap between the brake shoe and the drum surface. This gap should
be .125 inch - .50 inch (3mm - 13mm).