Installing Manifold Gauge Set; Service Hose Hook-Up - Komatsu 930E-2 Shop Manual

INSTALLING MANIFOLD GAUGE SET

Before attempting to service the air conditioning sys-
tem, a visual inspection of both the engine and system
components is recommended. Particular attention
should be paid to the belts, hoses, tubing and all
attaching hardware plus the radiator cap, fan clutch,
and thermostat. Inspect both the condenser and the
radiator for any obstructions or potential contamina-
tion. Minimize all the possibilities for error or malfunc-
tion of components in the air conditioning system.
Shut off engine. DO NOT attempt to connect serv-
icing equipment when the engine is running.
1. Be sure all valves on the manifold are closed all
the way (turn them clockwise).
2. Check the hose connections on the manifold for
tightness.
3. Locate the low and high side system service
fittings and remove their protective caps.
4. Connect the two service hoses from the manifold
to the correct service valves on the compressor
as shown in Figure 9-8. (High side to compressor
discharge valve and low side to compressor suc-
tion side.) Do not open service valves at this time.
This gauge hook-up process will be the same, regard-
less of the gauge set being installed. Whether it is a
recovery station or individual gauges, the connections
are the same. The procedures performed next will vary
depending what type of equipment is being used. If a
recovery/recycling station is being used, complete
servicing can be accomplished. Using only a set of
gauges will limit the servicing to only adding refrigerant
or observing pressures.
M09010 6/97
FIGURE 9-8. SERVICE HOSE HOOK-UP
Air Conditioning System
for HFC 134a Refrigerant
M9-11