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Use oil specifically refined for Deep Vacuum Pumps. Use of oil not refined for Deep Vacu-
um Pumps and/or operating with contaminated oil will void warranty.
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 attempting to add
oil.
b. Remove the rubber cap from the top of pump. (DO NOT USE DURING OPERATIONS)
Unscrew oil fill port.
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 port.
OIL CAPACITY:
3 CFM
1 Stage
6 CFM
1 Stage
10 CFM
2 Stage
2. CHECKING OIL LEVEL
a. Open the gas ballast valve (small brass fitting located next to the handle) one turn. Do not
remove! (AVAILABLE ON 2 STAGE PUMPS ONLY)
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 partially opened for the first part of the evacuation procedure.
After about two minutes close the valve and continue the evacuation procedure to reach ultimate
vacuum. Failure to close the valve during high vacuum operation 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 emits a controlled amount of dry air into the pump
during compression to minimize condensation 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.
Care should be taken to avoid contact of oil with skin or eyes. OIL MAY BE HOT! Used oil
should be properly disposed of in a leakproof corrosive-resistant container according to
local regulations.
a. After every evacuation, while the pump is warm and oil is thin, take a small sample of oil from
2
13.5 OZ / 400 ML
15.2 OZ / 450 ML
19.3 OZ / 570 ML
(2 STAGE MODELS)
www.mastercool.com
3 CFM
2 Stage
6 CFM
2 Stage
13.5 OZ / 400 ML
13.5 OZ / 400 ML
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