Steering Cylinder

Various types of steering cylinders are used depending on front axle type.

Steering Cylinder seal test
To check steering cylinder seals, operate engine at low idle speed. Turn steering wheel from lock to lock at least four times to remove all air from the system. Turn wheels fully to the left and stop the engine. Disconnect steering hose from left end of steering cylinder. Connect a high pressure cap on steering hose. Allow any oil to flow from the open union on steering cylinder. Start engine and operate at low idle speed. Check for oil leaking from open union and at the right steering shaft seals in end cap. A small amount of oil (up to 5 drops in 30 seconds) is permissible for leakage past the piston seals. There should be no leakage at shaft seals in end cap. If cylinder tests OK, repeat the test on right end of cylinder.

Tractors With Adjustable Front Axle


OVERHAUL
To remove the steering cylinder, first, disconnect steering hose at each end of cylinder. Plug or cap all openings. Remove the clevis pin at right end of cylinder shaft. Straighten lockstrip and unbolt lower pivot arm. Remove lower arm, then remove clevis end from anchor on axle main member. Lower cylinder assembly from upper pivot arm.

1—Exploded view of steering cylinder used on models with adjustable front axle.

To disassemble the cylinder, first clean exterior of cylinder and clamp lower pivot flange in a soft jawed vise. Remove elbow fitting (11—Fig.1) from left end of cylinder rod and clevis (15) from right end. Lift end of retaining ring (13) out of slot, then using a pin type spanner, rotate cylinder head (6) and work retaining ring out of its groove. Cylinder rod and piston assembly (3) can now be removed from cylinder tube (12). Remove remaining cylinder head in the same manner. All seals, "0" rings and back-up rings are now available for inspection and/or renewal. Clean all parts in a suitable solvent and inspect. Check cylinder tube (12) for scoring, grooving and out-of-roundness. Light scoring can be polished out by using a fine emery cloth and oil, providing a rotary motion is used during polishing operation. A cylinder tube that is heavily scored or grooved, or is out-of-round, should be renewed, Check piston rod and piston (3) for scoring, grooving and straightness. Polish out very light scoring with fine emery cloth and oil, using a rotary motion. Renew rod and piston assembly if heavily scored or grooved, or if piston rod is bent. Inspect bores of cylinder heads (6) and renew same if excessively worn or out-of-round. All "O" rings, seals, back-up rings and retainer rings are available in a seal kit. Lubricate ail "O" rings, back-up rings and seals during assembly.
Reassemble steering cylinder as follows: Install a new "0" ring (2) in groove of piston, then follow with new seal ring (1). Install "0" ring (7), back-up ring (8) and wiper seal (9) in each cylinder head (6) and back-up ring (5) and "0'' ring (4) over each cylinder head. Using a ring compressor or suitable hose clamp around piston seal ring (1), install piston and rod assembly. Install cylinder head assemblies over each end of piston rod and into cylinder tube. Align hole in groove of cylinder heads so they will accept nib on end of retaining rings (13). Rotate cylinder heads until retaining rings are pulled completely into cylinder tube. Using new "0" rings (10 and 14), install elbow (11) in left end of cylinder rod and clevis (15) on right end. Tighten clevis to a torque of 170-180 ft.-lbs (230-244 N-m).
Reinstall cylinder on tractor by reversing removal procedure. Tighten lower arm retaining cap screws to a torque of 80-90 ft.-lbs. (110-124 N-m). Bend corners of lock plate up against flat on cap screw heads. Bleed air from power steering.

Tractors With Nonadjustable (Cast) Front Axle


OVERHAUL.To remove the steering cylinder, first disconnect steering hose at each end of cylinder. Disconnect steering cylinder ball joint end from left steering arm. Remove pivot pin at right end of cylinder. Then, lift cylinder from tractor. Drain oil from cylinder, then thoroughly clean exterior of cylinder.
Fig.2—Exploded view of steering cylinder used on models equipped with nonadjustable (cast} front axle.


To disassemble steering cylinder, clamp the flat end of steering tube (1—Fig. 2) in a soft jawed vise so cylinder is in vertical position. Remove smalt slot head lock screw (9) and lockwasher from cylinder. Use a filter wrench CAS-04-535 or equivalent, rotate cylinder counterclockwise until the straight end of retaining ring (5) can be seen through slot in cylinder. Pry end of retaining ring out through slot and continue to turn cylinder counterclockwise until ring is removed. Pull steering rod and cylinder assembly from the tube (1). Remove seal ring (2), back-up ring (8) and "O" ring (4) from end of steering tube. Place steering rod ball joint in the vise, remove clamping bolt, then remove ball joint. Lightly clamp cylinder in the vise and pull rod and piston (6) from cylinder. Remove wiper seal (13) and seal ring (12) from cylinder and seal ring (8) and "0" ring (7) from piston.
Clean and inspect all parts. Inspect cylinder (11) for scoring or out-of-roundness. Light scoring can be polished out using a fine emery cloth and oil, providing a rotary motion is used during polishing operation. Renew cylinder if heavily scored or out-of-round. Check piston rod and piston (6) for scoring and straight ness. Polish out light scoring with fine emery cloth and oil, using a rotary motion. Renew rod and piston assembly if heavily scored or if rod is bent. All "O" rings, back-up rings, seal rings and wiper seal are available in a seal kit. Lubricate all internal parts with Hy-Tran Plus fluid during reassembly.
Reassemble steering cylinder by reversing the disassembly, keeping the following points in mind: Heat Teflon seal rings and back-up rings in clean Hy-Tran Plus oil to a temperature of 75° F (24° C) to make them more flexible. Tighten clamping bolt on ball joint to a torque of 60-65 ft.-lbs. (81-85 N-m).
For aid in installation, set distance from center of pivot pin hole to center of ball joint to 35-1/2 inches (905 mm). With front wheels in straight ahead position, reinstall cylinder assembly. Tighten ball joint nut to a torque of 50-100 ft.-lbs. (68436 N-m) and secure with cotter pin. When installation of cylinder is complete, bleed air from power steering.

Tractors With Front Drive Axle

Fig.3—Steering cylinder Is contained In back side of front drive axle housing.

OVERHAUL
The power steering cylinder is contained in the back side of front drive axle housing. See Fig.3. Cylinder can be disassembled without removing axle assembly.
Disconnect steering lines at each end of cylinder. Cap or plug all openings immediately. Clean exterior of cylinder and surrounding area. Disconnect tie rod ends from swivel housing arms. Unbolt and remove steering stop collar at each end of cylinder rod. Remove tie rods by unscrewing threaded studs (3) from ends of cylinder rod. Unbolt and remove right side guide (22—Fig. 4) and shim spacer (20). Withdraw piston and rod assembly, then remove cylinder sleeve (6) and left side guide (4). Remove scraper (2) and groove rings (3) from both end guides. Remove the two Teflon rings (8) and piston seal ring (9) from piston. Remove snap ring (10), collar ring (11) and split ring (12), raise, then tower piston and remove spacer (13) and "O" ring (14). Remove piston (15), spacer (16), split ring (17), collar ring (18) and snap ring (19).
Fig.4—Exploded view of steering cylinder used on models equipped with front drive axle.

Clean and inspect all parts for excessive wear or other damage. Inspect cylinder sleeve (6), piston (15), rod (23) and rod guides (4 and 22) for cracks, scoring or other damage. Light scoring can be polished out using fine emery cloth and oil, providing a rotary motion is used during the polishing procedure. Use all new "0" rings, seals and seal rings and lubricate with clean Hy-Tran Plus fluid during reassembly.
Reassemble cylinder by reversing disassembly procedure and adjust cylinder sleeve to zero end play as follows: With lips of grooved ring (3) and scraper ring (2) facing inward and "0" ring (1) in external groove, install left rod guide (4) with notch facing hydraulic port. With "0" rings (5 and 7) installed in grooves of cylinder sleeve, install sleeve until fully seated on left rod guide. Measure distance between outer and inner faces of right side rod guide and record the distance. Then, measure dis­tance between axle housing and end of cylinder sleeve and record the distance. Subtract the second distance from the first distance to determine correct thickness of shim spacer (20— Fig.4) to be used. Shim spacers are available in thicknesses of 0.035 to 0.071 inch (0.9 to 1.8 mm) in increments of 0.004 inch (0.1 mm). Install rod and piston assembly in cylinder sleeve. With lips of grooved ring (3) and scraper ring (2) facing inward in right side rod guide, use vaseline to stick the determined shim spacer to inside of rod guide. Install right side rod guide and tighten rod guide cap screws to a torque of 52 ft .-lbs. (70 N-m).
Apply Loctite 242 to the first three threads and in­stall threaded studs (3—Fig. 3) in cylinder rod ends.