Mastercool 90066-2V-110 6 CFM VACUUM PUMP (TWO STAGE) - Manual (Page 2)

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OPERATING INSTRUCTIONS
1. OIL FILL
This vacuum pump has been tested at the factory and shipped with only trace amounts of oil.
OIL MUST BE ADDED BEFORE OPERATING! Failure to add oil will damage cartridge and void
warranty!
a. Make sure the oil drain plug located at the bottom of the front casing is closed
before attempting to add oil.
b. Remove the large oil fill plug from the top of pump and insert the oil bottle into the fill
port.
c. Slowly add oil until oil level rises to the Oil “FULL” Line. Do not overfill with oil!
d. Replace the oil fill plug.
CAPACITY: 1.5 CFM = 5 oz. CAPACITY: 3 CFM = 8.8 oz. CAPACITY: 6 CFM = 7.8 oz.
2. CHECKING OIL LEVEL
a. Open the gas ballast valve (small brass fitting located next to the handle) one turn.
Do not remove! (3, 6 CFM)
b. Start pump and run with intake port capped for about two minutes. Observe the
oil level with the pump running. The oil level in the sight glass should be even with
the level line.
c. If the level is low, open the intake port and run pump for 15 seconds, stop pump and
observe oil level again. Add a small amount of oil as needed.
3. GAS BALLAST VALVE (3, 6 CFM ONLY)
The gas ballast valve must be opened 1/4 turn for the first part of the evacuation procedure. This
will help to eliminate moisture and the life of the vacuum pump. After about two minutes close
the valve and continue the evacuation procedure to reach ultimate vacuum. Failure to close the
valve completely during the final evacuation will result in high vacuum reading.
During the first stages of evacuation, vapors are highly concentrated. Unfortunately, some vapors
will condense into a liquid and mix with the oil, thus reducing the oil’s ability to produce a deep
vacuum. The
GAS BALLAST VALVE emits a controlled amount of dry air into the pump dur-
ing compression to minimize this effect and keep oil relatively clean during the first part of the
evacuation.
Periodically remove the Gas Ballast Valve Needle and clean or replace the O-ring. Clean mating
surfaces and lightly coat with vacuum pump oil before securely retightening.
4. CHANGING OIL
In order to reach the deep vacuum required, your vacuum pump needs clean, moisture-free oil
during evacuation. Dirty oil becomes a mixture of corrosive acids
and water that effects the pump’s ability to pull a deep vacuum. Left sitting in the