Bush Hog 665H, 965H, 865H, 765H manual Replace Center Section Assemblies, Replacing Spool Seals

VALVE REPAIR - DISASSEMBLY

Figure 11

RETURN SPRING

SPRING COLLAR

SCREW, 5/16-18 x 3/4

SPOOL COLLAR

LOCKWASHER

SCREW, 1/4-20 x 7/8

RETURN SPRING

DETENT BALL FOLLOWER

BONNET

RETAINING RING

STOP COLLAR

DETENT BALL

SCREW, 1/4-20 x 7/8

SCREW 5/16-18 x 3/4

RETAINER

SPOOL RETURN

COLLAR SPRING

BACK-UP

WASHER

	LOCKWASHER
		SPRING
O-RING SEAL		COLLAR

STANDARD SPRING CENTERED BONNET ASSEMBLY

U-CUP SEAL

FLOAT SLEEVE

RETAINING SLEEVE

DETENT SPRING

O-RING SEAL

LOCKWASHER

FLOAT BONNET ASSEMBLY

Replace Center Section Assemblies:

Note: For the purpose of these instructions we will consider the section containing the MAIN RELIEF VALVE as the left side of the valve.

1.Remove control valve from the backhoe.

2.Thoroughly clean the exterior of the valve before beginning disassembly procedures.

3.Since the valve will be assembled in the same order, each section should be marked numerically so that they can be reassembled in the same sequence.

4.Mount the valve vertically in a vise to facilitate dis- assembly and assembly.

5.Remove the 3 tie rod nuts from the right end sec- tion, using a thin-wall socket.

6.Valve sections can now be removed by sliding the sections along the tie rods.

7.Thoroughly clean the O-ring counterbores and the ground surfaces of each section. Place O-ring seals, ordered as a kit, in proper counterbores. For better sealing it is recommended that all O-rings, used in the counterbores, are replaced with new parts.

8.Replace the sections on tie rods with the O-ring counterbores facing the right end of the valve. Be careful replacing the sections so that the section O- rings are not moved from the counterbores.

9.When all sections are assembled on the tie rods, tighten the tie rod nuts equally to 20 ft. lbs. torque, NO MORE - NO LESS, or spools may bind and stick.

Replacing Spool Seals:

Note: For the purpose of these instructions we will consider the control handle side of the valve as the FRONT, and the opposite side as the BACK.

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