Testing And Adjusting

Usage:

Introduction

NOTE: For complete operation and maintenance instructions, refer to Operation And Maintenance Manual, D3C, D4C, and D5C Series III Track-Type Tractor, Form No. SEBU6731.

NOTE: For Systems Operation and Troubleshooting, make reference to Systems Operation, D3C, D4C, and D5C Series III Tractor Power Train, SENR5335.

NOTE: For specifications with illustrations, make reference to Specifications, D3C, D4C, D5C Series III Tractor Power Train, SENR5334. If the specifications given in SENR5334 are not the same as given in the Systems Operation and the Testing and Adjusting, look at the printing date on the back cover of each book. Use the Specifications given in the book with the latest date.

Show/hide table

When tests and adjustments are made to the transmission or the torque converter, the parking brake must be OFF. To prevent movement of the machine and personal injury do the procedure that follows.

1. Lower the blade and ripper (if equipped) to the ground.

2. Put blocks in front of and behind the tracks.

3. Let only approved personnel on the machine and keep all other personnel off the machine and in clear view of the operator.

4. When testing must be done in a closed area and whenever possible, activate the service brakes if the parking brake can not be used.

NOTE: All tests and adjustments must be made with the oil in the hydraulic control system at normal temperature of operation. Be sure the linkage adjustments are correct before tests are made.

Power Train Hydraulic System Schematic

Transmission Hydraulic Controls (Engine Running, First Speed FORWARD)
(1) Oil filter. (2) Steering controls. (3) Oil cooler. (4) Torque converter. (5) Speed selector spool. (6) Body of selector and pressure control valve. (7) Modulation relief valve. (8) Oil pump. (9) Load piston. (10) Orifice. (11) Orifice. (12) Pressure differential valve. (13) Magnetic screen. (14) Flow control orifice. (15) Ratio valve for torque converter. (16) Reservoir in bottom of transmission case. (17) Direction selector spool. (A) Pressure tap for transmission oil pump. (B) Pressure tap for converter outlet. (C) Pressure tap for transmission lubrication. (D) Pressure tap for converter inlet (P3). (E) Pressure tap for speed clutch (P1). (F) Pressure tap for direction clutch (P2).

Location Of Pressure Taps

(A) Oil pump.

(B) Torque converter outlet. (C) Lubrication. (D) Torque converter inlet (P3).

(G) Left steering clutch.

(6V0184 Transmission Test Cover Installed)
(E) Speed clutch (P1). (F) Direction clutch (P2). (I) Plug for load piston (LP).

Cover Not Removed
(E) Speed clutch (P1). (F) Direction clutch (P2). (I) Plug for load piston (LP).

(H) Right steering clutch.

Transmission Pressure Chart

D3C

Pressure Differential Valve Test

1. With the engine stopped, move the transmission selector lever to any position except NEUTRAL.

2. Engage the brakes and hold them.

3. Start the engine and run it at HIGH IDLE (2400 RPM).

4. The direction clutch pressure (P2) must be 0.0 kPa (0.0 psi).

5. The speed clutch pressure (P1) must be 2600 ± 105 kPa (377 ± 15 psi).

6. The direction clutch pressure (P2) must remain at 0.0 kPa (0.0 psi).

7. Move the transmission selector lever to NEUTRAL and then to THIRD SPEED FORWARD or REVERSE.

8. The direction clutch pressure (P2) must now be 380 ± 55 kPa (55 ± 8 psi) less than speed clutch pressure (P1).

D4C

Pressure Differential Valve Test

1. With the engine stopped, move the transmission selector lever to any position except NEUTRAL.

2. Engage the brakes and hold them.

3. Start the engine and run it at HIGH IDLE (2400 RPM).

4. The direction clutch pressure (P2) must be 0.0 kPa (0.0 psi).

5. The speed clutch pressure (P1) must be 2897 ± 105 kPa (415 ± 15 psi).

6. The direction clutch pressure (P2) must remain at 0.0 kPa (0.0 psi).

7. Move the transmission selector lever to NEUTRAL and then to THIRD SPEED FORWARD or REVERSE.

8. The direction clutch pressure (P2) must now be 380 ± 55 kPa (55 ± 8 psi) less than speed clutch pressure (P1).

D5C

Pressure Differential Valve Test

1. With the engine stopped, move the transmission selector lever to any position except NEUTRAL.

2. Engage the brakes and hold them.

3. Start the engine and run it at HIGH IDLE (2400 RPM).

4. The direction clutch pressure (P2) must be 0.0 kPa (0.0 psi).

5. The speed clutch pressure (P1) must be 2517 ± 138 kPa (365 ± 20 psi).

6. The direction clutch pressure (P2) must remain at 0.0 kPa (0.0 psi).

7. Move the transmission selector lever to NEUTRAL and then to THIRD SPEED FORWARD or REVERSE.

8. The direction clutch pressure (P2) must now be 380 ± 55 kPa (55 ± 8 psi) less than speed clutch pressure (P1).

Selector And Pressure Control
(9) Load piston. (18) Spacers.

Transmission Oil Pump Bench Test Specifications

Type ... Gear

Number of sections ... One

Rotation (seen from drive end) ... Clockwise

Output [with SAE No. 10W oil at 49°C (120°F) (minimum) ... 52.5 liter/min (13.65 U.S. gpm)

At a pump speed of ... 1800 rpm

At a pressure of ... 2070 kPa (300 psi)

Transmission Control Linkage

Torque for all (1/4 in) locknuts (jam nuts) that hold the rod ends on the cables ... 8 ± 3 N·m (6 ± 2 lb ft)

Torque for all (5/8 in) jam nuts ... 38 ± 7 N·m (28 ± 5 lb ft)

(A) Neutral lock position ... 77.0 mm (3.00 in)

(E) Dimension ... 95.0 mm (3.75 in)

(3) Assembled length of rod assembly ... 146.0 mm (5.75 in)

(11) Apply 7M7260 Liquid Gasket between cover and housing.

(17) Use shims as required to obtain end play of ... 0.025 to 0.10 mm (.0010 to .004 in)

Show/hide table

Do not make any adjustments to the transmission control linkage while the engine running.

Adjustment of Transmission Control Linkage

1. Disconnect yoke (13) on cable assembly (15) from lever.

2. Disconnect yoke (12) on cable assembly (16) from lever.

3. Check length of cable assemblies (15) and (16) inside housing (14). Make adjustments as needed to dimension (E).

4. Move direction control spool (6) to the FORWARD position against stop (7) by pulling out on cable assembly (15).

5. Move speed selector spool (8) to the NEUTRAL position against stop (9) by pushing in on cable assembly (16).

6. Adjust set screw (4) for neutral lock lever (10) to dimension (A).

7. Move speed control lever (5) until it contacts neutral lock lever (10).

8. Make adjustments, as needed, to the length of rod assembly (2) and/or yoke (12) on cable assembly (16) until the pin can be installed in the lever.

9. Adjust the length of rod assembly (3) to 146.0 mm (5.70 in) from center to center of rod end ball.

10. Install yoke (13) on cable assembly (15) with pin.

11. Move transmission neutral lock lever (10) to the OPERATING position (pulled up).

Transmission Selector Lever on the Forward Side of the Neutral Opening. (1) Transmission selector lever. (18) Shift guide.

12. With the cover removed from housing (14), move transmission selector lever (1) to all positions indicated on shift shift guide (18). A detent must be felt in each position. Also check to make sure that the jam nuts on the cables do not make contact with the shields on the cables.

NOTE: Final adjustment, if needed, may be obtained by doing one of the following:

a. Loosen the cable that needs adjusting at the housing on the fuel tank console and move the cable in or out to obtain the desired adjustment.

b. Loosen the housing at the transmission (shown in View D-D) and thread the housing in or out to obtain the desired adjustment.

(15) Direction cable. (16) Speed cable.