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2500 Automatic Tank Gauge
100
Installation and Operations Manual
Table 12: Broken Negator Spring - Possible Cause / Action
Calibration Repeatability Unstable
Caution
Broken negator spring may cause injury. Stand clear of gauge head when remov-
ing back cover.
4
Dials stopped?
Yes -
• Check for frozen tape sprocket sheave shaft. Repair/
replace.
• Check for frozen accessory shaft. Repair/replace.
• Check dial gear engagement with pinion gear. Adjust/
replace.
• Check gauge checker for broken spring and damaged
ratchet pawl. Replace.
No -
• Go to 5.
5
Counter dial wheels stopped; dial
rotates?
Yes -
• Check for worn/broken counter pinion gear and counter
wheels.
• Replace as necessary.
Possible Cause
Action
Possible Cause
Action
1
Dirty gauge housing?
Yes -
• Clean with automotive-type spray degreaser.
No -
• Go to 2.
2
Tape or cable off elbow pulley?
Remove elbow covers.
Yes -
• Reseat and lubricate the gauge.
No -
• Go to 3.
3
Elbow pulley shaft or bushing is
worn or?
Yes -
• Repair or replace
No -
• Go to 4.
4
Tape conduit dirty?
Yes -
• Remove and clean.
No -
• Go to 5.
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