PS Magazine - TB 43-PS-692

PS, The Preventative Maintenance Monthly

ISSUE 692

JULY 2010
PS Magazine - TB 43-PS-692 - Page 26 of 33
48
PS 692
JUL 10
49
PS 692
Replacing the Compressor
1.
Unplug the MBU-V3’s power cable. Make sure the burner unit is cool to the
touch. Drain the fuel tank. To drain the tank, see WP 0011 00 in TM 10-7310-
281-13&P (Jul 04, w/Ch 1, Sep 05). Remove the reflective heat shield and burner
assembly from the frame. To remove the shield and burner, see WP 0026 00 in the
-13&P TM.
2.
Disconnect the compressor power wire harness (1).
3.
Disconnect the two air lines (2) from the compressor (3). The upper air line has an
internal width of
3
/
8
inch. The lower air line has an internal width of
1
/
4
inch.
4.
Loosen and remove the two hose clamps (4). Lift the compressor off the mounting
plate (5).
Inspecting the Control Panel
Inspecting and Testing the Compressor
5.
Put the replacement compressor on the
mounting plate. Replace and tighten the hose clamps.
6.
Reconnect the air lines.
7.
Reconnect the compressor power wire harness.
Removing the Fuel Delivery Block
NOTE:
You must remove the fuel delivery block from the frame when replacing the
ignitor, fuel nozzle, fuel line or air lines.
1.
Unplug the MBU-V3’s power cable. Make sure the burner unit is cool to the
touch. Drain the fuel tank. To drain the tank, see WP 0011 00 in TM 10-7310-281-
13&P.
2.
Open the control panel.
3.
Remove the
two
7
/
16
-in self-locking
nuts and washers (1, 2)
that hold the fuel
delivery block to the
burner assembly.
4.
Remove the green
ground wire (3) from the
base of the MBU-V3.
5.
Slide the fuel delivery
block off the threaded studs
of the burner assembly.
6.
Disconnect the fuel line (4),
the fuel feeder line (5) and
the air hoses (6, 7).
7.
Disconnect the fuel shut-off
solenoid harness connector (8)
and the air/Fll solenoid harness
connector (9).
8.
Disconnect the flame
sensor harness connector (10)
and the ignitor (11).
To inspect the control
panel, see WP 0023 00 in
TM 10-
7
310-281-13&P.
NOTE:
The
MBU-V3
does not
require
calibration.
To inspect and test
the compressor,
see WP 0024 00 in
TM 10-
7
310-281-13&P.
1
2
3
4
5
5
3
1, 2
4
10
11
8
9
6,
7
692.48-49.indd
1-2
5/25/10
4:05:20 PM
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