Posted by Owen Aaland on March 01, 2008 at 12:54:36 from (65.161.86.122):
In Reply to: 706 LP hydraulics posted by Zach from TX on March 01, 2008 at 10:46:15:
The 706 has two separate hydraulic systems that share a common reservoir and filter. The rear pump provides for the hitch and auxiliary valves. The front pump provides for steering, brakes, TA control and lube. Excess oil from the front pump is sent to the oil cooler in front of the radiator and then returned to lube the ring gear and pinion and differential.
Noting the price you paid the tractor probably has been sitting for a while. The first thing to check is the oil level. Make sure it is on the full mark. The dip stick is to the right of the brake pedals. If the level is OK, check the filter. It is located behind a cover on the side of the rear frame below the brake pedals. If the level and the filter look OK, with the engine running, spin the steering wheel to see if you can draw a prime on the front pump. If that does not work, remove the plug for the orifice on the MCV (Multiple Control Valve). The MCV is located on the side of the clutch housing just ahead of the clutch pedal. The plug to remove is located about half way up the rear side of the valve assembly. It is the one with the 5/8 inch head.
With the plug out, start the engine and be prepared to shut it off quickly. When the pump gets primed it will shot out three gallons per minute from this opening. If you still can not pick up the prime, pressurize the reservoir by putting air pressure in the dip stick tube. You will not need much pressure but it takes quite a volume of air to build any pressure in the housing. As before, be ready to quickly shut down the engine.
If you still can not get the front pump to work after trying these things it will be time to look at mechanical problems with the system.
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