Pressure Hose Torque Specifications - Hummer H1 Service Manual

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PRESSURE HOSE TORQUE SPECIFICATIONS

CAUTION: To avoid potential thread or fitting damage, hand
start connections before using wrenches.
Air conditioning system fittings are a common source of refrig-
erant leaks. When service requires disconnecting and connect-
ing fittings, observe the following:
• When tightening or loosening hose and tube fittings, use
two wrenches for equalized support (Figure 11-7).
Figure 11-7: Hose and Tube Fittings
• Plug open ends of hoses after disassembly. Do not re-
move plugs from hose fittings until each component is
ready for connection. This will prevent moisture and dirt
contamination which can cause compressor wear and
system blockage.
• Make sure that O-rings are properly seated before as-
sembly (Figure 11-8).
• Carefully interlock male and female ends of hoses
(Figure 11-9).
• Before making any hose and tube connection, apply a
few drops of refrigerant oil to the O-rings and threaded
portions of the connector. Make connections quickly.
• Tighten fittings to proper torque specification based on
hose size.
05745159
Heating/Ventilation/Air Conditioning (HVAC)
#6 Liquid
Hose
#8 Discharge
Hose
#10 Suction
Hose
#12 Suction
Hose
Figure 11-8: Correct Seating O-Rings
FEMALE
END
CORRECT
Figure 11-9: Proper Connection of Hose End
Pressure Hose Torque Values
Torque
Hose Size
(Ft. Lb.)
Minimum Maximum Minimum Maximum
11
15
21
24
11-17
INCORRECT
INCORRECT
PROPERLY
SEATED
MALE
END
INCORRECT
Torque
(Newton Meters)
13 15 17
20 20 27
27 28 36
28 33 38