2J8412 MOLDBOARD (L.H.) Caterpillar parts
8A
Rating:
Alternative (cross code) number:
CA2J8412
2J-8412
2J8412
CA2J8412
2J-8412
2J8412
Weight: 297 pounds 134 kg.
BULLDOZER,
Compatible equipment models: 2J8412:
Number on catalog scheme:
None
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Information:
Adjustment Procedure (Alignment of Steering Pilot Valve)
Illustration 3 g01293932
Pilot valve (1) Lever (2) Hole (3) Locknut (4) Bolt (5) Plunger (6) Locknut (7) Sleeve
If an adjustment is required, engage the parking brake and disconnect all hydraulic lines to the pilot valve.
Loosen two bolts (11) that hold the pilot valve to mounting plate (8) .
Install a pin of 3.2 mm (0.125 inch) diameter into hole (2) in lever (1) and into hole (9) in housing (10) .
Line up the pilot valve so that roller (12) is at the bottom of lever (1) and there is no preload on either plunger (5). Note: The bottom of lever (1) is the end toward hole (2) .
Tighten mounting bolts (11) and remove the pin.
Check the adjustment by disengaging the parking brake and reinserting the pin through holes (2) and (9). Do not move the steering control lever in order to align the holes. If the pin goes through both holes, the alignment of the valve is correct and no further adjustment is needed. If the pin does not go through both holes, the alignment is not correct and the adjustment should be repeated.
Verify that the steering control lever moves smoothly in both directions.
Connect the hydraulic lines. Start the engine. Purge the air from the pilot circuit by initiating a turn several times in each direction.Adjustment Procedure (Actuator)
Shut off the engine. Engage the parking brake. Remove the boot or pull up the boot in order to allow access to locknut (3) .
Loosen two locknuts (3) and adjust two bolts (4) inward until a gap exists between bolts (4) and plungers (5) on both sides of the valve.
Adjust bolts (4) outward in order to remove all free play between bolts (4) and plungers (5). Do not preload plunger (5) .
Tighten locknuts (3) to a torque of 12 4 N m (106 35 lb in) and reinstall the boot.Adjustment Procedure (Pressure)
Note: Check the charge pressure before making any adjustments to the pilot pressure.
Shut off the engine. Engage the parking brake. Remove the boot or pull up the boot in order to allow access to locknuts (6) .
Assemble tooling (A) .
Illustration 4 g01259355
(Y1) Pressure tap for the pilot signal for Right Steer (Y2) Pressure tap for the pilot signal for Left Steer
Attach tooling (A) to pressure taps (Y1) and (Y2) .
Illustration 5 g00492486
Angle measurement guide
Illustration 6 g00765773
Make a copy of the angle measurement guide. See Illustration 5. With the parking brake ENGAGED, tape the portion of the guide with the letters to the housing of the steering control lever. See Illustration 6. The arrow that corresponds with the letter (N) should be in line with the center of the stud, as shown. Mark the edge of the steering control lever so that the mark is aligned with the arrow that corresponds with the letter (N) .
Start and operate the engine at LOW IDLE. Read the pressure on the two gauges. The correct pressure range is below 200 kPa (30 psi). If the pressure is greater than 200 kPa
Illustration 3 g01293932
Pilot valve (1) Lever (2) Hole (3) Locknut (4) Bolt (5) Plunger (6) Locknut (7) Sleeve
If an adjustment is required, engage the parking brake and disconnect all hydraulic lines to the pilot valve.
Loosen two bolts (11) that hold the pilot valve to mounting plate (8) .
Install a pin of 3.2 mm (0.125 inch) diameter into hole (2) in lever (1) and into hole (9) in housing (10) .
Line up the pilot valve so that roller (12) is at the bottom of lever (1) and there is no preload on either plunger (5). Note: The bottom of lever (1) is the end toward hole (2) .
Tighten mounting bolts (11) and remove the pin.
Check the adjustment by disengaging the parking brake and reinserting the pin through holes (2) and (9). Do not move the steering control lever in order to align the holes. If the pin goes through both holes, the alignment of the valve is correct and no further adjustment is needed. If the pin does not go through both holes, the alignment is not correct and the adjustment should be repeated.
Verify that the steering control lever moves smoothly in both directions.
Connect the hydraulic lines. Start the engine. Purge the air from the pilot circuit by initiating a turn several times in each direction.Adjustment Procedure (Actuator)
Shut off the engine. Engage the parking brake. Remove the boot or pull up the boot in order to allow access to locknut (3) .
Loosen two locknuts (3) and adjust two bolts (4) inward until a gap exists between bolts (4) and plungers (5) on both sides of the valve.
Adjust bolts (4) outward in order to remove all free play between bolts (4) and plungers (5). Do not preload plunger (5) .
Tighten locknuts (3) to a torque of 12 4 N m (106 35 lb in) and reinstall the boot.Adjustment Procedure (Pressure)
Note: Check the charge pressure before making any adjustments to the pilot pressure.
Shut off the engine. Engage the parking brake. Remove the boot or pull up the boot in order to allow access to locknuts (6) .
Assemble tooling (A) .
Illustration 4 g01259355
(Y1) Pressure tap for the pilot signal for Right Steer (Y2) Pressure tap for the pilot signal for Left Steer
Attach tooling (A) to pressure taps (Y1) and (Y2) .
Illustration 5 g00492486
Angle measurement guide
Illustration 6 g00765773
Make a copy of the angle measurement guide. See Illustration 5. With the parking brake ENGAGED, tape the portion of the guide with the letters to the housing of the steering control lever. See Illustration 6. The arrow that corresponds with the letter (N) should be in line with the center of the stud, as shown. Mark the edge of the steering control lever so that the mark is aligned with the arrow that corresponds with the letter (N) .
Start and operate the engine at LOW IDLE. Read the pressure on the two gauges. The correct pressure range is below 200 kPa (30 psi). If the pressure is greater than 200 kPa