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16. Install the neutral bracket and neutral spring onto the spool.
17. Install the handle onto the spool, aligning the marks made at assembly.
18. Engage the neutral spring with the handle and neutral bracket.
19. Install the external tooth lock washer and nut onto the spool and torque to 10 to 12 ft. lbs. (13.6 to 16.3 Nm).
20. Align the control sleeve so it’s slot will engage the swashplate feedback pin (slot positioned toward the pump
cover) and insert the sleeve into the housing.
21. Install the special washer onto the control spool.
22. Install the control spool assembly into the control sleeve, being certain that the control handle is oriented as
noted during disassembly. The slot in the handle end of the spool must be oriented toward the pump cover.
23. Orient the spool washer (if used) so it’s flat clears the neutral bracket.
24. Align the marks made at disassembly and fasten the neutral bracket to the housing with the locking flange
head screw.
NOTE:
NOTE:
NOTE:
NOTE:
NOTE: Pumps using a hex head screw and star lock washer to retain the neutral bracket should have this
hardware replaced with the locking flange head screw.
25. Readjust the neutral position of the control.
INSPECTING & ADJUSTING THE MANUAL DISPLACEMENT CONTROL
INSPECTING & ADJUSTING THE MANUAL DISPLACEMENT CONTROL
INSPECTING & ADJUSTING THE MANUAL DISPLACEMENT CONTROL
INSPECTING & ADJUSTING THE MANUAL DISPLACEMENT CONTROL
INSPECTING & ADJUSTING THE MANUAL DISPLACEMENT CONTROL
Disconnect the external control linkage from the control handle and check for neutral by manually operating the control
handle. Releasing the control handle should allow the pump to return to neutral. If operation is satisfactory with the
external control linkage disconnected, the problem is not in the hydrostatic transmission.
If operation is satisfactory with the external control linkage disconnected from the handle, the control may be incorrectly
adjusted.
CHECK/HIGH PRESSURE RELIEF VALVES
CHECK/HIGH PRESSURE RELIEF VALVES
CHECK/HIGH PRESSURE RELIEF VALVES
CHECK/HIGH PRESSURE RELIEF VALVES
CHECK/HIGH PRESSURE RELIEF VALVES
The system check/relief valves have the dual purpose of providing make-up oil during by-directional rotation and
providing protection from system over pressure. When the problem occurs in one direction only, interchange the
check/relief valves to see if the problem changes to the other direction. If so, one check/relief valve cartridge is either
malfunctioning or does not have the proper setting.
CAUTION
CAUTION
CAUTION
CAUTION
CAUTION
The relief valves are factory set and should not be
The relief valves are factory set and should not be
The relief valves are factory set and should not be
The relief valves are factory set and should not be
The relief valves are factory set and should not be
tampered with except for replacing the entire cartridge.
tampered with except for replacing the entire cartridge.
tampered with except for replacing the entire cartridge.
tampered with except for replacing the entire cartridge.
tampered with except for replacing the entire cartridge.
Disassembly may change the setting and cause erratic
Disassembly may change the setting and cause erratic
Disassembly may change the setting and cause erratic
Disassembly may change the setting and cause erratic
Disassembly may change the setting and cause erratic
unit operation or premature failure.
unit operation or premature failure.
unit operation or premature failure.
unit operation or premature failure.
unit operation or premature failure.
PUMP WITH MANUAL DISPLACEMENT CONTROL
PUMP WITH MANUAL DISPLACEMENT CONTROL
PUMP WITH MANUAL DISPLACEMENT CONTROL
PUMP WITH MANUAL DISPLACEMENT CONTROL
PUMP WITH MANUAL DISPLACEMENT CONTROL
MDT46 SWING PUMP MAINTENANCE CONTINUED...