135
Scheduled Maintenance
Typical Gates Sonic Tension Meter
5.13 Blower & UHP Pump Drive
Belt Adjustment Procedure
Checking Belt Tension
Check drive belt tension, pulleys and belt align-
ment every 200 hours. Adjust or replace as re-
quired. The proper way to check belt tension is to
use a tension tester. While a simple spring scale
type tester will do the job, the more sophisticated
sonic tension meter is the only method recom-
mended by Hog Technologies.
Make sure the waterblasting system is shutdown
with the truck in the service position before check-
ing the belt tension or adjusting the belts.
Using a sonic tension meter to check belt
tension:
The sonic tension meter detects the vibration
frequency in the belt span and converts that mea-
surement into the actual static tension in the belt.
Begin by entering the belt unit weight, belt width
and the span length. To measure the span vibra-
tion, press the “measure” button on the meter,
tap the belt span while holding the microphone
approximately 1/4” (.6 Mm) away from the back of
the belt. The tension meter will display the static
tension vibration frequency. If the frequency is
lower than the minimum recommended frequency,
the belt should be tightened. If it is higher than
the maximum recommended frequency the belt
should be loosened.
Blower Belt Tension Frequency Specica-
tions:
• New Belt = 46-48 Hz
• Used Belt (more than 20 hours of operation)
= 39-41 Hz
UHP Pump Belt Tension Frequency Speci-
cations:
• New Belt = 61-63 Hz
• Used Belt (more than 20 hours of operation)
= 52-55 Hz
NOTICE:
THE PROCEDURE IN THIS EXAMPLE IS FOR THE GATES
SONIC TENSION METER. SONIC METERS FROM DIFFERENT
MANUFACTURERS WILL REQUIRE PROCEDURES UNIQUE
TO THOSE METERS.
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