Ace FMC-75-HYD Series - Page 6

REGULATING HYDRAULIC FLOW TO THE SPRAYER PUMP
FLOW LIMITER
The ow limiter is a hydraulic device designed to shut off the ow of hydraulic oil when a motor’s
rated ow is exceeded. On tractors with LOAD SENSING (LS) Closed Center hydraulic systems,
it prevents failures due to excess ow. These tractors present a great potential to run the motors
beyond their rated speeds. The ows out of the hydraulic valves can exceed 29 GPM while the
motors are rated at 4 to 11 GPM. The ow limiter protects the Ace motor by shutting off when
hydraulic ows exceed the motor’s capacity.
The ow limiter should not be used on OPEN Center or PRESSURE COMPENSATING Closed
Center hydraulic systems. The ow limiter should not be used with a restrictor orice.
Consult Ace Form # FLOW LIMITER for additional information and specications.
WARNING: FAILURE TO REGULATE OIL FLOW WILL CAUSE MOTOR FAILURE
There are three general types of hydraulic systems: 1) Load Sensing (LS), also known as
Pressure-Flow Compensating Closed Center, 2) Pressure Compensating Closed Center (PC), and
3) Open Center (OPEN). The ow of hydraulic oil is regulated in a different manner for each type
of hydraulic system. Consult the Tractor Hydraulic System Pump Selection Guide(HSG), Internet
Hydraulic Selection Guide (IHSG) at www.AcePumps.com, or your tractor dealer to determine the
type hydraulic system on your tractor and the method of regulation.
SHUT-OFF PRESSURE
Shut-off pressure is the sprayer system pressure with all ow turned off. This means closing
the boom, agitation, and any by-pass valves. It is the highest pressure a centrifugal pump will
achieve for a given RPM and relates directly to the ow of hydraulic oil. A pressure gauge must
be located between the pump discharge and the shut off valves.
Maximum Shutoff Pressure:
FMC-75-HYD 100 PSI FMC-150FS-HYD 120 PSI
FMC-HYD 100 PSI FMC-150SP-HYD 120 PSI
FMC-150-HYD 120 PSI FMC-200-HYD-210/310 80 PSI
FMC-150F-HYD 120 PSI FMC-200-HYD-304 120 PSI
LOAD SENSING CLOSED CENTER SYSTEM
Regulate oil ow with tractor’s FLOW CONTROL and FLOW LIMITER.
(Do not use restrictor orice.)
Setup Instructions:
1. Suggested: Remove adapter and install ow limiter in motor inlet port (marked I).
2. Close motor needle valve: loosen jam nut, screw needle valve clockwise
until seated, and lock jam nut. (factory setting)
3. Shut off sprayer boom and agitation valves.
4. Adjust tractor ow control to minimum ow setting (turtle).
5. Move hydraulic lever to “Lower/Retract” position to start pump.
6. Adjust tractor ow control until sprayer shut-off pressure is below
maximum shown in SHUT-OFF PRESSURE section above.
Note: If the ow limiter stops oil ow to the motor: 6a) Move hydraulic
lever to “Float” or “Neutral” to remove oil pressure from the ow limiter.
6b) Adjust tractor ow control to a lower ow position.
6c) Repeat steps 5 and 6.
7. Open the sprayer agitation valve to get desired spraying pressure
.
Flow Limiter
(Optional)
Flow Control
4