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800-00162
MDT46 SWING PUMP MAINTENANCE CONTINUED...
CHECK AND HIGH PRESSURE RELIEF VALVES
CHECK AND HIGH PRESSURE RELIEF VALVES
CHECK AND HIGH PRESSURE RELIEF VALVES
CHECK AND HIGH PRESSURE RELIEF VALVES
CHECK AND HIGH PRESSURE RELIEF VALVES
PUMP CHARGE RELIEF VALVE
PUMP CHARGE RELIEF VALVE
PUMP CHARGE RELIEF VALVE
PUMP CHARGE RELIEF VALVE
PUMP CHARGE RELIEF VALVE
If charge pressure is low (less than 220 psi above case pressure), the charge relief valve should be inspected. Inspect
for foreign material holding the poppet open, and for scoring or wear on the poppet and seat in the housing.
Adjustment of the charge pressure is accomplished by changing the shim thickness behind the spring.
MANUAL DISPLACEMENT CONTROL (MDC) SUPPLY ORIFICE
MANUAL DISPLACEMENT CONTROL (MDC) SUPPLY ORIFICE
MANUAL DISPLACEMENT CONTROL (MDC) SUPPLY ORIFICE
MANUAL DISPLACEMENT CONTROL (MDC) SUPPLY ORIFICE
MANUAL DISPLACEMENT CONTROL (MDC) SUPPLY ORIFICE
NOTE:
NOTE:
NOTE:
NOTE:
NOTE: Not all models have an orifice.
If the system is sluggish or will not operate in either direction, inspect the orifice. For pumps with serial number 02-XX-
XX-XXXXX or below, remove the hex plug using a 9/16" wrench and remove the orifice with an 1/8" internal hex wrench.
For pumps with serial number 03-XX-XX-XXXXX or above, remove the pipe plug with a 3/16" internal hex wrench and
the orifice with a 5/32" internal hex wrench.
HYDRAULIC DISPLACEMENT CONTROL (HDC) AND ELECTRICAL DISPLACEMENT CONTROL (EDC) ORIFICES
HYDRAULIC DISPLACEMENT CONTROL (HDC) AND ELECTRICAL DISPLACEMENT CONTROL (EDC) ORIFICES
HYDRAULIC DISPLACEMENT CONTROL (HDC) AND ELECTRICAL DISPLACEMENT CONTROL (EDC) ORIFICES
HYDRAULIC DISPLACEMENT CONTROL (HDC) AND ELECTRICAL DISPLACEMENT CONTROL (EDC) ORIFICES
HYDRAULIC DISPLACEMENT CONTROL (HDC) AND ELECTRICAL DISPLACEMENT CONTROL (EDC) ORIFICES
NOTE:
NOTE:
NOTE:
NOTE:
NOTE: Not all models have orifices. Pumps controlled by EDC or HDC should have a screen plug installed
in place of the control inlet orifice installed in pumps with MDC. Pumps controlled by EDC or HDC
have two (2) control orifices located under the servo covers.
PUMP CHARGE RELIEF VALVE
PUMP CHARGE RELIEF VALVE
PUMP CHARGE RELIEF VALVE
PUMP CHARGE RELIEF VALVE
PUMP CHARGE RELIEF VALVE
MANUAL DISPLACEMENT CONTROL SUPPLY ORIFICE
MANUAL DISPLACEMENT CONTROL SUPPLY ORIFICE
MANUAL DISPLACEMENT CONTROL SUPPLY ORIFICE
MANUAL DISPLACEMENT CONTROL SUPPLY ORIFICE
MANUAL DISPLACEMENT CONTROL SUPPLY ORIFICE
