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In Reply to: hydraulics on 404, need help for friend posted by G3 on Saturday, February 23, 2008:
G3: The 404 draws it'd hydraulic oil from the transmission and it only holds 7 gallons. Where did he pour the oil in. Transmission if it has a fill to level plug, it should be near the clutch pedal, about 1/3 of way from bottom on chassis.
Here is a trouble shooting list. Hitch will not raise, could be caused by;
1. unloading valve orfice plugged.
2. unloading valve piston sticking.
3. flow control valve spring broken, piston
sticking or check ball stuck in orfice.
4. unloading valve ball not seating.
5. main relief valve spring broken or valve is
leaking.
6. cylinder safety (cushion) valve faulty.
7. auxillary valve cover O ring damaged.
8. linkage disconnected from control lever or
valve.
I know very little about the 404, just happens to be covered in the same IT manual as my 140. From the looks of the photo in the manual, most of those items are in the hydraulic unit under the seat.