Great Plains 3P300 Operator Manual - Manual (Page 24)

20 3P300 S/N HH1113+ Great Plains Manufacturing, Inc.
500-103M-A 09/14/2009
Ace Pump Flow Limiter (Optional)
The flow limiter (see page 54) is a hydraulic device
designed to shut off the flow of hydraulic oil when a spec-
ified flow is exceeded. On tractors with LOAD SENSING
(LS) Closed Center hydraulic systems, this device limits
the flow of oil to the Ace motor and prevents failures due
to misapplication.
Newer Case-IH, John Deere, New Holland, and CAT
tractors, present a great potential to turn the motors
beyond their rated speeds. Flows out of the hydraulic
valves can exceed 20 gpm while the motors are rated at
4-11 gpm. The flow limiter protects the Ace motor by
shutting off when hydraulic flows exceed the motor’s
capacity.
The flow limiter should not be used on OPEN Center or
PRESSURE COMPENSATING Closed Center hydraulic
systems. The flow limiter should not be used with a
restrictor orifice.
Flow Limiter Installation
1.
Install the flow limiter in the inlet port of the Ace
motor.
2. Close the needle valve on the Ace motor by loosen-
ing the jam nut and screwing the needle valve in a
clockwise direction all the way down.
3. Connect the hydraulic hoses so that the pump runs
with the hydraulic lever in the “Lower/Retract” posi-
tion. Connect return hose to Low Pressure Return
Port, when available.
4. Shut off boom and agitation valves on the sprayer to
deadhead the sprayer pump flow.
5. Adjust the flow control on the tractor to the minimum
flow setting (turtle).
6. Move the hydraulic lever to the “Lower/Retract” posi-
tion.
Note: Always shut the pump off in the “Float” position.
This eliminates high pressure being trapped in the
return line and protects hydraulic seals. Avoid
returning the oil to the remote valve; use the Low
Pressure Return port, when available.
7. Adjust the flow control on the tractor until the sprayer
system dead head pressure is 80 psi.
Note: If the flow limiter stops the flow of oil to the motor:
7a) Move the hydraulic lever to the “Neutral” posi-
tion. This removes the oil pressure from the flow
limiter and allows it to reset.
7b) Adjust the flow control to a lower flow position.
7c) Repeat step 6 and step 7.
8. Set sprayer pressure by opening the agitation valve.
Figure 9
Ace Pump Flow Limiter
23395