Operator`s manual

Operator's Manual: Models CB-1400, CB-1800, and CB-2800
A-13
Oil Pump Components (continued)
Vacuum Testing the Oil Pump
Vacuum testing the oil pump is a very accurate way to
determine the following:
• The condition of the pump -- the ability of the
pump to pull a vacuum and suck oil from the tank.
• The condition of the fittings, gaskets and seals
from the ball valve to the pump -- these
components must all be airtight to avoid suction
leaks.
The following procedure provides instructions for
vacuum testing the pump and canister filter on systems
equipped with a ball valve.
IMPORTANT NOTE: For the pump to pull and hold
vacuum, it is critical that all fittings are airtight.
Check the cover bolts, the 1/4" plug in the return port
and the acorn nut (on older style pumps only). If any
of these fittings are loose, the pump may not pull a
vacuum or may lose the vacuum rapidly. It is also critical that all fittings in the suction line, including
fittings on the canister filter, are 100% airtight.
1. Refer to Section 5: Oil Pump Priming in this manual. Follow the instructions to prime the oil
pump. NOTE: The oil pump will not pull a vacuum if the pump is dry. There must be oil in the
gears of the pump before the pump can pull a vacuum.
2. With the pump running, open the bleeder two to three full turns, and make sure that oil is flowing
from the bleeder. DO NOT close the bleeder yet.
3. Close the ball valve and observe the vacuum gauge. NOTE: The ball valve must have a
stainless steel ball and should be pressure tested by the manufacturer to ensure that it does not
leak. If the ball valve leaks, the vacuum test will not be accurate.
4. The vacuum should increase within 15 seconds to 20 to 25 inches of vacuum. When the vacuum
gauge reads 20 to 25 inches of vacuum, first close and tighten the bleeder, then turn the pump
off.
NOTE: If the pump will not pull at least 20 inches of vacuum, there is a very serious suction
leak or the pump is damaged.
5. If there are no suction leaks, the system will hold vacuum. NOTE: It is acceptable for the
vacuum to drop one to five inches within one minute as the seal in the pump seats. The vacuum
should then hold steady for 15 minutes.
IMPORTANT: If the vacuum drops more than one to five inches within the first minute, there is
one or more leaks somewhere between the pump and the ball valve. Do the following:
• Wipe your finger along the cylinder at the shaft of the pump. If there is oil here, the pump
seal is damaged. Replace the pump.
• Disassemble and clean all the fittings from the pump to the ball valve. Properly seal all
fittings with Permatex #2 non-hardening gasket sealer or equivalent. Check the condition of
the o-ring on the canister filter and tighten the four canister filter bolts in a crisscross pattern.
• Repeat the procedure to vacuum test the system to ensure that the system is air tight.
FIGURE A6 - Oil Pump System
BALL VALVE
VACUUM GAUGE