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10.7 Vacuum pump oil change
After 60 hours of runtime (or 1000 hours if the
Long Life Pump test is completed successfully),
the vacuum pump oil must be replaced.
1. Disconnect AC442 from power.
2. Using a flathead screwdriver, rotate the front locking
screw and lift the front housing.
Fig. 27: Changing vacuum pump oil
1
Oil filling plug
2
Oil inspection window
3
Lower drain plug
3. Place a bowl under the vacuum pump oil drain hole.
Remove the upper filling plug and the lower drain
plug to allow the oil to drain from unit.
4. Once the pump has been emptied, reinstall the lower
drain plug.
5. Fill the pump with new oil through the upper fill port
using a funnel if needed. Fill until the oil appears
halfway up the oil level inspection window.
6. Once the pump has been filled, reinstall the upper fill
plug.
7. Close front housing and secure locking screw.
8. Connect to power and turn on.
9. From the MAINTENANCE menu, press until
PUMP OIL REPLACEMENT is highlighted and
press arrow. Press the RESET key to set the counter.
The level and clearness of the vacuum pump oil can
be checked by removing the rubber plug located on
the front-left side of the unit.
1901016-85
10.8 Replace filter dryer
Warning - Risk of frostbite from escaping
refrigerant
Refrigerant causes severe frostbite on the
skin.
Check the service hoses for damage.
Firmly connect the service quick-release
couplings to the service hoses.
Wear protective goggles.
Wear protective gloves.
Unit operation is disabled at the end of the filter service life.
Each filter is marked with a unique code. This code must be
entered when replacing the filter. It is not possible to
operate the AC442 if the same code is re-used. It is
advisable to keep a supply of filters in stock to avoid
downtimes due to the unit being disabled.
The AC442 is disabled once 90kg (198lb) of R134a
refrigerant has passed through the filter. A new filter must
be installed and its unique code entered in the AC442 before
vehicle A/C service can be performed.
Fig. 28: Changing filter dryer
1
Filter dryer
1. To begin the filter replacement process, from the
MAINTENANCE menu, scroll until FILTER REPLACEMENT
is highlighted and press arrow .
2. Insert the new filter code using the keypad.
3. Using a flathead screwdriver, rotate the front locking screw and
lift the front housing.
4. Verify that the 2 o-rings are included and positioned correctly
prior to attaching to housing.
5. Loosen the filter using a 1-3/8"
(35mm) wrench.
6. Remove the filter
7. Insert a new filter
8. Tighten the filter to 74 ft-lbs (100N-
m)
9. Carefully close front housing and
secure locking screw.
10. Allow unit to perform the
automatic leak test requested by the software when unit loads
Maintenance | AC442 | 24 en
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