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Kubota L1200 Front End Loader

Kubota L1200 Loader - Assembly Instructions

Kubota L1200 Loader Main Assembly: 1 - Lock Nut (3/8-16), 2 - Serrated Machine Screw (3/8-16х1"), 3 - Pin (3-3/8), 4 - Bucket Cylinder, 5 - Pin (1x2-1/8), 6 - Pin (1x2-7/8), 7 - Cotter Pin (1/4x1-1/2), 8 - Washer Bushing, 9 - Decal, 10 - Grease Fitting (1/4-28), 11 - Cap Screw (1/2-13x4-3/4), 12 - Right Side Frame, 13 - Left Side Frame, 14 - Caution Decal, 15 - Handle Nut (7/16-14), 16 - Cotter Pin (1/8x1”), 17 - Bolt (7/16-14x3-1/4), 18 - Bumper, 19 - Lock Nut (1/2-13), 20 - Lift Cylinder, 21 - Boom, 22 - Pin (1x3-5/8), 23 - Bucket Indicator Rod, 24 - Lock Nut (3/8-16), 25 - Bucket Indicator Guide Tube

Installing mountings and hoses

Install mounting brackets and hoses on the tractor according to instructions packed with mounting kits.

Installing side frames

Using a hoist locate the side frames (12, 13) over the mounting brackets. Using hardware from mounting kit secure side frame as specified in instructions packed with mounting kit.

Installing bucket attachment

Attach bucket to boom (21) and bucket cylinders (4) with 1”x3-3/8 pins (3). Push lock taps flush against bucket ears, align the holes and secure with 3/8x1” serrated machine screws (2) and lock nuts (1).

Installing bucket level indicator

Attach guide tube (25) to the right outside bucket cylinder ear on boom (21) with 3/8 lock nuts. Leave lock nuts loose enough so guide tube rotates freely. Slide rod (23) into guide tube. Pin rod (23) to bucket and bucket cylinder with pin (22) and 1/4x1-1/2 cotter pin. Locate tractor and loader on a level surface. Level the bottom of bucket on the level surface and with bucket level cut off the excess rod (23) flush with the end of guide tube (25).

Hydraulic System: 1 - Oil Line (BBC), 2 - Oil Line (RBC), 3 - Oil Line (RLC), 4 - Oil Line (BLC), 5 - Tube Clamp, 6 - Lock Washer (3/8), 7 - Cap Screw (3/8-24x1”), 8 - Hose (3/8x38), 9 - Hose Clamp, 10 - Hose (3/8x19), 11 - Street Elbow (3/8x90), 12 - Tube Clamp, 13 - Hose (3/8x30)

Kubota L1200 Loader - Hydraulic cylinder repair

Cylinder disassembly procedure

1. To remove the retaining ring: Hold the cylinder tube stationary and turn the cylinder head until the beveled end of the retaining ring is visible in the slot in the cylinder tube. Turn the cylinder head in the proper direction to cause the beveled end of the retaining ring to catch the slot edge, and thread out through the slot (If necessary, use a pipe wrench on the cylinder head). If the piston assembly is removed intact from the double acting bucket cylinders, the V-packing on the piston will probably be damaged by the retaining ring groove in the cylinder tube. Step 2 is the recommended procedure for removing the piston rod assembly from the 1-3/4” double acting bucket cylinder without damaging the V-packings on the piston.

2. To relieve compression on the V-packings of the double acting cylinder to prevent damaging them: With the piston rod pushed all the way in, rotate the rod end until the hole in the compression nut is visible through the cylinder port. Insert a metal shaft (bolt or pin punch) through the oil port and into the hole as shown in Figure.

With the compression nut held stationary by the metal shaft, turn the piston rod out approximately four turns, to relieve compression on the piston V-packing. Remove the metal shaft and pull rod assembly out until piston strikes the cylinder head. Slide the cylinder head out of the cylinder tube. Carefully pull the piston assembly to a position where the rear edge of the piston just protrudes from the cylinder tube. Turn the piston rod to thread it completely out of the compression nut, and pull the rod out. If the V-packing is to be replaced, the whole assembly can be removed at one time. Carefully remove the piston. Leave the V-packing and the compression nut in the cylinder. Carefully remove the V-packings, one at a time.

3. Completely disassembly the piston and cylinder head. Remove all internal seals and packings, and clean all the parts in a suitable solvent. Discard and replace all damaged or worn parts. Inspect the cylinder tube for rust. If the tube is scored and the score mark cannot be removed with light buffing with honing paper, the tube must be replaced.

Kubota L1200 Loader - Installing repair parts in bucket cylinder

Double acting bucket cylinder: 1 - Shaft Assembly, 2 - Wiper Seal, 3 - Cylinder Head, 4 - Back-Up Washer, 5 - O-Ring, 6 - O-Ring, 7 - Piston, 8 - V-Pack, 9 - Caplug, 10 - Compression Nut, 11 - Wire Retaining Ring, 12 - Cylinder Tube

Install wiper seal (2), back-up washer (4) and O-rings (5) into cylinder head (3). Install O-ring (6) on outside of head. Remove the sharp edge on the outside diameter of the piston end of the piston rod (A). Lubricate the wiper seal, leather washer and O-ring in the cylinder head with hydraulic oil and carefully slide the cylinder head onto the piston rod. The piston V-packing set (8) must be installed on piston (7) so that the lips of the packing face toward the rod end of the cylinder.

Lubricate the V-packing with hydraulic oil and slide them onto the piston. Lubricate the O-ring and the leather washers (4 and 5) and insert one leather washer and one O-ring into the piston (7). Carefully slide the piston onto the cylinder rod. Thread the compression nut (10) onto the end of the piston rod. Do not tighten the nut. Lubricate the V-packing on the piston and the large O-ring on the cylinder head with hydraulic oil and slide the piston rod assembly all the way into the cylinder tube. Insert a metal shaft through the oil port in the cylinder tube and into the hole in the compression nut. Turn the piston rod tightly into the compression nut. Turn the cylinder head so that the hole in the retaining ring groove appears in the slot in the cylinder tube. Insert the hook-end of the retaining ring into the hole and turn the cylinder head to thread the retaining ring into the groove.

Kubota L1200 Loader - Installing repair parts in lift cylinder

Double acting lift cylinder: 1 - Cylinder Shaft, 2 - Wiper Seal, 3 - Snap Ring, 4 - Reinforcement Washer, 5 - V-Pack, 6 - Cylinder Head, 7 - O-Ring, 8 - O-Ring, 9 - Piston, 10 - V-Pack, 11 - Caplug, 12 - Piston Compression Nut, 13 - Wire Retaining Ring, 14 - Cylinder Tube

Remove the sharp edge on the outside diameter of the piston end of the piston rod. Place a new V-packing set (5) in the cylinder head (6) with the lips on the packing facing inward. Place the reinforcement washer (4) on the V-packing, and force down firmly, below snap ring groove. Install the snap ring (3), with the rounded outer edge facing down, in the groove. Make sure that it is firmly seated. Install the new wiper seal (2) on the snap ring with the lip of the seal facing out, and flush with the edge of the cylinder head. Place a new O-ring (7) in the groove around the outside of the cylinder head. Lubricate the V-packing and wiper seal and carefully slide the cylinder head onto the piston rod.

The V-packing set must be installed so the lips of the packing face toward the rod end of the cylinder when installed on the piston. Lubricate the V-packing (10) with hydraulic oil and slide them onto the piston (9). Lubricate the small O-ring (8) with hydraulic oil and carefully slide it over the threaded end of the piston rod. Place the piston on the rod against the small O-ring. Thread the compression nut (12) onto the end of the piston rod (1). Do not tighten the nut. Lubricate the cylinder head and O-ring (6 and 7) and the piston and V-packing (9 and 10) and slide the assembly all the way into the cylinder tube. Insert a metal shaft through the oil port in the cylinder tube and into the hole in compression nut. Turn the piston rod tightly into the compression nut.

Turn the cylinder head so that the hole in the retaining ring groove appears in the slot in the cylinder tube. Insert the hook-end of the retaining ring into the hole and turn the cylinder head to thread the retaining ring into the groove.

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