Yetter GERMINATE UNIFORMITY 2940 Operator's Manual page 54

To ensure the hydraulic compressor motor doesn't exceed recommended operating RPM level, the hydraulic oil flow control valve has been
preset. In some instances, the compressor may run below optimum rpm, or will not reach 145psi of tank pressure read at the gauge on the
compressor tank causing the VDM to think the compressor is running continuously. (High Compressor Run Time message will appear on cab
controller) If this is the case, an adjustment to the flow control valve needs made. Only open the flow control valve enough to allow compressor
to build to 145psi tank pressure read at the gauge on compressor tank. Opening the flow control too far could cause over speeding and
reduced service life of the compressor. The liquid filled gauge on the hydraulic block will read the amount of hydraulic pressure (should be
2500-3000psi) Follow the instructions below to make the proper adjustment.
NOTE: Before making any adjustments to the flow control valve, adjust the tractor hydraulic flow fully open. Adjusting the tractor's
hydraulic flow will affect the compressor's RPM. The hydraulic motor speed on the hydraulic compressor should not exceed
1350RPM. RPM's on the hydraulic compressor may be checked via the fan blades with an optical tachometer.
STEP 1: Engage the hydraulics to the compressor and press ACTIVATE SYSTEM icon.
STEP 2: Make adjustments while hydraulic motor is running or should be running. Open the tank drain to engage
compressor if necessary.
STEP 3: Insert a 3/16 Allen wrench into flow control valve. Loosen jam nut by turning ½ wrench counterclockwise.
STEP 4: Using the Allen wrench, SLIGHTLY turn the flow control valve counterclockwise (the equivalent to 3
degrees or 1/32 of a turn) to increase the hydraulic motor speed.
STEP 5: Hold the Allen wrench in place and tighten the jam nut. Each time an adjustment is made, allow the compressor
to build to its potential 145psi shut off mark. If 145psi is not achieved, drain tank pressure until compressor turns
on, and make another adjustment. Repeat these steps until 145psi is achieved so that the compressor runs
smoothly without struggle. DO NOT RUN MOTOR ON COMPRESSOR MORE THAN 1350RPM! RPMs can be
checked with an optical tachometer using the fan blades. Once the flow control valve is set properly, hold the Allen
wrench in place and tighten the jam nut.
LEAK TESTING:
A leak testing procedure should be performed after set-up of the 2940 Air Adjust system is complete. This procedure
shall be performed at the beginning of each planting season and every 20 hours of in season use. In addition, it should
be performed if the user notices a lack of air pressure availability or if the compressor is running an abnormally
high duty cycle or run time. It will help keep the duty cycle in check, thus extending the life of the compressor. The
most efficient way to perform a leak test is to use shop air, if available, to allow for a quieter environment to detect an air
leak better. A 2940-382 shop air adaptor is provided in the 2940-174 spare fittings bag. The shop air adaptor is equipped
with a shut off valve. Attach your matching male coupler to the open ¼"NPT & install airline between the 3/8PTC fitting &
the water separator inlet port. Wrap the male threads of the shop air fitting with Teflon tape.
54
OPERATION PRECAUTIONS
Pre-Field Operation Guide