Dynojet 248: Maintenance Guide User Manual
Page 8
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 224 Dynos with Air Over HyDraulic (AOH) Brake Systems
4
M
AINTAINING
THE
M
ODEL
224 AOH D
RUM
B
RAKE
S
HOE
C
LEARANCE
The 224 AOH drum brake shoe clearance must be checked once per month. If you
have upgraded your 224 dyno to use the Spring Applied Air Release (SAAR) braking
system, refer to “Maintaining the SAAR Brake Shoe Clearance” on page 8.
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
Using the red button on the pendant, cycle the drum brakes on and off
several times until all of the air is released from the system.
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 - .375 inch (3mm - 10mm).
4
If the brake shoe clearance is out of specification, perform the following steps:
4a
Remove the two 3/8-inch bolts and washers that secure the brake slave
cylinder to the dyno frame.
Figure 2: 224 Dyno AOH Brake—Remove the Bolts from Brake Slave Cylinder
AD204
remove bolts
and washers
remove bolts
and washers