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12
Series 90
Functional Description
Pressure Override (POR) - 180 Frame Size Only
The pressure override valve (POR) modulates the control
pressure to the displacement control to maintain a pump
displacement which will produce a system pressure level
less than or equal to the POR setting. For unusually rapid
load application, the high pressure relief valve function of
the multifunction valves is available to also limit the
pressure level.
The pressure override consists of a three-way normally
open valve which operates in series with the pump
displacement control. Control supply pressure is nor-
mally ported through the pressure override valve to the
displacement control valve for controlling the pump's
displacement. If the system demands a pressure above
the override setting, the POR valve will override the
control by reducing the control pressure supplied to the
displacement control. As the control pressure reduces,
the internal forces tending to rotate the swashplate
overcome the force of the servo pistons and allow the
pump's displacement to decrease.
POR-Valve (180 Frame Size only)
90000802E
Shuttle
Valve
Multi-Function Valve
Multi-Function Valve
Bypass
Adjustment
Charge Pressure
Relief Valve
Pressure
Override Control Valve
To Control
Port "A"
Port "B"
Summary of Contents for DPT60
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Page 59: ...Contents iv 032015 PN 4 ...
Page 180: ...Troubleshooting 70 35 032015 PN 133 ...
Page 192: ...Troubleshooting 70 47 032015 PN 145 ...
Page 210: ...Warranty DX EMISSIONS EPA 19 12DEC12 2 2 TS1721 UN 15JUL13 90 6 032015 PN 163 ...
Page 218: ...Warranty DX EMISSIONS CARB 19 01AUG14 8 8 RG26036 UN 24JUN14 90 14 032015 PN 171 ...
Page 219: ...Warranty 90 15 032015 PN 172 ...
Page 225: ...Engine Registration IBC 2 032015 PN 178 ...
Page 228: ...Engine Registration IBC 5 032015 PN 181 ...
Page 229: ...Engine Registration IBC 6 032015 PN 182 ...
Page 230: ...Axial Piston Pumps and Motors Service Manual Series 90 ...
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Page 373: ...www dexteraxle com OPERATION MAINTENANCE SERVICE MANUAL 600 8 000 lb Axles Related Components ...
Page 455: ...Service Record Date Service Performed Mileage ...
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