The Tee Test is a method of testing a hydraulic
system under conditions as close as possible to those
existing when the system is in operation. When used
correctly, the Tee Test will find the cause of a problem.
When used as part of a preventive- maintenance
program, it will give an indication of a problem that can
cause a failure.
When an analysis is made of the hydraulic
system, a standard procedure must be used to check it.
The method used to check the system will follow these
steps in order:
1. Visual Checks
2. Performance Tests
3. Instruments Tests
The procedures to follow for each of these steps
are given in the Testing and Adjusting section of the
Service Manual for each machine.
(Ejector and Bowl System)
1. With the engine stopped, slowly remove the
cap on the hydraulic tank to release any
pressure and then tighten. Start the engine
and move the ejector to the full forward
position. This will cause a vacuum in the
tank to keep oil leakage at a minimum.
Stop the engine.
WARNING: Do not install the adapter
for the supply line for the pump or the
return line assembly with the engine ON
(running). Injury to personnel can be the
2. Remove the plug for the tee test from the supply line
3. Install a supply line adapter in the supply line elbow.
NOTE: Install the adapter as rapidly as possible to keep
the oil loss at a minimum.
4. Remove the plug for the tee test from the filter cover
5. Install the return line adapter.
6. Connect the return line hoses and the supply line
hose to the flow meter.
Connect the return line hose to the return line
8. Connect the supply line to the supply line adapter.
WARNING: A plain coupler will not open
the valve in the adapter for the pump
supply line. Use a valved coupler against a
valved nipple when hoses are connected.
9. Install the tachometer generator with the correct drive.
10. Install the cable between the tachometer generator
and the input connection for the tachometer (rpm)
on the flow meter.
PREPARATION OF SYSTEM FOR TEST
2. Start the diesel engine.
3. Move the ejector control lever to the FOR-WARD or
4. With the engine at test rpm, slowly turn the manual
load valve clockwise until the pressure goes upl) to
5. Look at the oil temperature gauge.
6. When the oil temperature is 100° F, turn the manual
load valve clockwise until the pressure is 1500 psi.
7. When the oil temperature is 1600 F, move all control
levers several times to get full cylinder movement of
8. Move the cylinders and run the elevator as long as
needed to get the desired oil temperature of 1500 F
all through the system.
9. Put a chain around the elevator to prevent movement.
SCRAPER EJECTOR AND BOWL SYSTEM TEST
Write Down the Basic Test Data
NOTE: Conditions in the hydraulic system must be
constant before you write down the test data. The
control levers must be held in the exact position desired.
Best results are found when oil temperature is 150 5