
Great Plains | 166-486M | 2019/01/29
100
Spartan
II
607
Troubleshooting
Magnehelic
®
Gauge
If a Magnehelic
®
gauge does not read zero with the
fan off, inspect the gauge, and zero the gauge as
needed.
Check for chamber and breather line problems
before setting gauge to zero. Setting the gauge to
zero cannot accurately compensate for leaks and
blockages.
Zero the Magnehelic
®
gauge on level ground with
the fan off, and if possible, under no-wind conditions.
Turn the set screw (1) on the meter face until it reads
zero from the tractor driver’s viewing position.
Port ID for troubleshooting:
(2) Over-pressure relief port (with plug in place)
(3) Low-pressure port (breather or atmospheric
pressure)
(4) High-pressure port (from manifold chamber)
Alternate high/low ports are plugged.
Winter testing/maintenance advisory
Gauge readings may be inaccurate or
sluggish below -7°C.
Problem
Cause
Solution
Non-zero
with fan off
Zero drift
Zero per instructions
below
Gauge
reading
lower than
expected
Relief port plug
missing/damaged
Replace plug
Breather line
blocked or kinked
Clear breather line
Leak in sensing
line
Check line to
chamber
Gauge damaged
Check for loose
cover, damaged
O-ring
0
10
3
0
20
40
50
1
3
2
4
i