Woods Equipment S105-3, S106-3 SPRING-LOADED Wheel Yoke Adjustment, SPOOL, 3-WAY Valve, Operation

hammer. See Figure 19. Install snap ring and repeat on opposite cup.

4.Repeat step 1 & step 2 to install remaining cups in remaining yoke.

5.Move both yokes in all directions to check for free movement. If movement is restricted, rap on yokes sharply with a hammer to relieve any tension. Repeat until both yokes move in all directions without restriction.

SPRING-LOADED

WHEEL YOKE ADJUSTMENT

Tighten elastic stop nuts on spring bolts until 1/4" of bolt thread extends through nut.

1-SPOOL, 3-WAY VALVE

This valve is an extremely closely-fitted unit. Great cau- tion should be taken to keep all dirt and impurities out of it. Any foreign matter could ruin sealing surfaces.

Open-Center or Closed-Center

This valve can be used with tractors having either a closed-center or open-center hydraulic system. The valve, as shipped, is ready for use with open-center systems. To adapt it for use with closed-center sys- tems, remove the plug adjacent to the outlet port and replace with the power-beyond sleeve and plug included in box of parts. Also, reset pressure relief valve to a closed position by removing cap (45) and turning adjustment screw (43) all the way in. Replace cap (45).

In operation, an open-center system allows oil to flow freely through valve when all spools are in neutral. it is used on most tractor systems. The closed-center valve is blocked, allowing no oil to circulate when spools are in neutral. This system is used on late model John Deere 3010, 4010, etc., Ford model 6000, and MF models 1100 and 1130.

Operation

The valve spool is equipped to operate a single-acting cylinder and has a float position detent. The spool will automatically return to neutral when not in detent. With spool in neutral, cylinder will be held in position.

Servicing

Spool Sticking

Any tendency of spools to stick in position is usually caused when mounting bolts are pulled down too tight, or the valve is mounted on an uneven surface. Also, excessive pressure will make spools stick.

Lift Check Service

The load lift checks are used to prevent a load from dropping prior to starting to raise when the spool is being moved slowly to the raised position from neutral. If these checks leak by, so that the load does not hold properly, remove lift checks, inspect the check and seats, and replace if necessary.

Spool Removal

The spool is selectively fitted in body and cannot be interchanged or exchanged. However, it may be removed to replace seals, but it is not necessary that it be removed completely. To replace seals on any spool, remove handle and snap ring, then push spool far enough out back of valve to expose V-cup seal on han- dle end. Remove and replace with new seal V-cup fac- ing inward. Remove retaining screw from other end of spool. Slide spool through the new seal, being careful not to roll over the edge. Slide forward far enough to expose the seal in back of valve. Replace it the same way, slip spool back into its normal position, and reas- semble.

Fitting leakage

Use a thread sealant on all fittings to prevent leakage.

29977 (Rev. 1/23/2009) Dealer Service 27