Mastercool 90060 1.5 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 valve located below the front casing is closed before at
tempting to add oil. (See ref. #4 in parts breakdown.)
b. Remove the large brass oil fill plug from the top of pump and insert the oil bottle
into the fill port. (See ref. #5 in parts breakdown.)
c. Slowly add oil until oil level rises to the top of the Oil Level Line.
Do not overfill with oil!
d. Replace the oil fill plug.
CAPACITY: 1.5 CFM (42 LIT/MIN) = 10 oz.
2. CHECKING OIL LEVEL
a. Open the gas ballast valve (small brass fitting located next to the handle) one turn.
Do not remove!
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
The gas ballast valve must be 1/4 turn to fully opened for the first part of the evacuation
procedure. After about two minutes close the valve and continue the evacuation pro-
cedure to reach ultimate vacuum.
FAILURE TO OPEN THE GAS BALLAST VALVE MAY
RESULT IN DAMAGE TO YOUR CARTRIDGE. Failure to close the valve during evacuation
will result in poor vacuum performance.
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 emmits a controlled
amount of dry air into the pump during 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 pump, this sludge will
rust and erode internal surfaces...shortening the pump’s life.