Usage:
Systems Operation
NOTE: For Systems Operation and Troubleshooting, make reference to Systems Operation, Testing and Adjusting, D4H, D4H Series II, and D4H Series III Tractors Power Train, SENR3119.
Specifications
NOTE: For specifications with illustrations, make reference to Specifications, D4H, D4H Series II, and D4H Series III Tractors Power Train, SENR3118. If the specifications given in SENR3118 are not the same as given in the Systems Operation, Testing and Adjusting, look at the printing date on the front cover of each book. Use the Specifications given in the book with the latest date.
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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. |
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1. Lower all attachments to the ground.
2. Put blocks in front of and behind the tracks.
3. Let only approved personnel on the machine. 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 power train hydraulic system at normal operating temperature. Be sure the linkage adjustments are correct before tests are made.
Power Train Hydraulic System Schematic
Transmission Hydraulic Controls
(1) Priority valve [part of oil filter (4)]. (2) Oil pump. (3) Steering and brake control valve. (4) Oil filter. (5) Selector and pressure control valve body. (6) No. 5 clutch. (7) No. 4 clutch. (8) Resonator assembly. (9) Torque converter. (10) Sump (in case of case and frame). (11) Steering clutch and brake lubrication. (12) Speed selection spool. (13) Load piston. (14) Torque converter outlet relief valve. (15) Modulation relief valve. (16) Pressure differential valve. (17) Direction selection spool. (18) Torque converter ratio valve. (19) Transmission lubrication. (20) No. 3 clutch. (21) No. 2 clutch. (22) No. 1 clutch. (23) Oil cooler. (A) Priority valve pressure tap. (B) Converter inlet pressure tap (P3). (C) Converter outlet pressure tap. (D) Speed clutch pressure tap (P1). (E) Direction clutch pressure tap (P2).
Location of Pressure Taps
Right Side of Steering Clutch and Brake Control Valve
(3) Steering clutch and brake control valve. (A) Priority valve. Note: A port on the left side of the valve at the same location may also be used to check pump/priority valve pressure.
(14) Torque converter outlet relief valve. (C) Torque converter outlet.
(G) Left steering clutch. (H) Left brake. (J) Right brake. (K) Right steering clutch.
(B) Converter inlet (P3). (D) Speed clutch (P1). (E) Direction clutch (P2). (F) Transmission lube.
(L) Steering clutch and brake lubrication (right side-front tap) (left side-rear tap).
(LP) Load piston plug.
Transmission Pressure Chart
Pressure Differential Valve Test
With the engine stopped, move the transmission selector lever to any position except NEUTRAL. Engage the brakes and hold them. Start the engine and run it at HIGH IDLE. Direction clutch pressure (P2) must be 0 kPa (0 psi) and speed clutch pressure (P1) must be 2550 ± 105 kPa (370 ± 15 psi). Move the selector lever to NEUTRAL and then to Third Speed FORWARD or REVERSE. Direction clutch pressure (P2) must be 380 ± 55 kPa (55 ± 8 psi) less than the speed clutch pressure.
NOTE: If the vehicle is equipped with a neutral start switch, the transmission control lever must be in NEUTRAL before the starter can be engaged to start the engine.
Transmission Oil Pump Bench Test Specifications
Type ... Gear
Number of sections ... Two
Rotation (seen from drive end) ... Counterclockwise
Output of transmission and torque converter section:
Use SAE 10W oil at 49°C (120°F)
minimum ... 57 liter/min (15 U.S. gpm)
At a pump speed of ... 1800 rpm
At a pressure of ... 1725 kPa (250 psi)
Output of steering clutch and brake lubrication section:
Use SAE 10W oil at 49°C (120°F)
minimum ... 152 liter/min (40 U.S. gpm)
At a pump speed of ... 1800 rpm
At a pressure of ... 345 kPa (50 psi)
Transmission Hydraulic Control Valve
(5) Selector and pressure control valve body. (13) Load piston. (26) Spacers.
Torque Converter Outlet Relief Valve
(14) Relief valve. (25) Spacers.
Location of Priority Valve
(1) Priority valve (under cover). (4) Oil filter.
Priority Valve (Located in Oil Filter Housing)
(1) Priority valve. (24) Spacers.
Steering And Brakes Pressure Chart
NOTE: Pressure values are with engine at MAXIMUM rpm and transmission in NEUTRAL.
Steering and Brake Pressure Taps
(G) Left steering clutch. (H) Left brake. (K) Right steering clutch. (J) Right brake.
Steering and Brake Control Valve
(27) Shims to adjust clutch pressures. (28) Shims to adjust brake pressures. (29) Shims to adjust brake residual pressure.
Linkage Adjustments
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To prevent possible personal injury, do not make any adjustments to the control linkage with the engine running unless necessary and then let only approved personnel on the machine. Keep other personnel off the machine and in clear view of the service personnel. |
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Transmission Controls and Parking Brake Linkage
Transmission Control Linkage (Type 1 shown)
(1) Rod assembly. (2) Rod. (3) Rod assembly. (4) Parking brake lever. (5) Rod assembly. (6) Rod assembly. (7) Rod end. (8) Rod assembly. (9) Lever. (10) Lever. (11) Rod assembly. (12) Rod assembly. (13) Lever.
Type 1: (8PB1-8PB2080, 9DB1-9DB962) Type 2: (8PB2081-UP, 9DB963-UP, 9GJ1-Up, 8PJ1-Up)
NOTE: While the Type 1 and Type 2 linkages look somewhat different, the adjustment procedures are the same.
Torque for all 3/8 in. locknuts (jam nuts) that hold the rod ends in place on the rods ... 14 ± 4 N·m (10 ± 3 lb ft)
Torque for all 3/8 in. locknuts on rod end ball studs ... 25 ± 7 N·m (18 ± 5 lb ft)
NOTE: All rod assembly measurements must be made in a straight line between the centerlines of the rod end mounting holes.
(1) Assembled length of rod assembly (Type 1) ... 481 ± 1 mm (18.94 ± .04 in)
Assembled length of rod assembly (Type 2) ... 471 ± 1 mm (18.54 ± .04 in)
(3) Assembled length of rod assembly ... 113 ± 1 mm (4.45 ± .04 in)
(5) Assembled length of rod assembly (Type 1) ... 252.5 ± 1.5 mm (9.94 ± .06 in)
Assembled length of rod assembly (Type 2) ... 240 ± 1.5 mm (9.45 ± .06 in)
(6) Assembled length of rod assembly ... 367 ± 1 mm (14.45 ± .04 in)
(11) Assembled length of rod assembly:
(8PB, 9DB, 9GJ) ... 435 ± 1 mm (17.13 ± .04 in)
(8PJ) ... 387.5 ± 1.0 mm (15.25 ± .04 in)
(12) Assembled length of rod assembly:
(8PB, 9DB, 9GJ) ... 554 ± 1 mm (21.81 ± .04 in)
(8PJ) ... 504.5 ± 1.0 mm (19.86 ± .04 in)
Transmission Control Linkage Adjustment Procedure
1. Position shift lever (14) as shown in View A-A (centered in slot).
2. Position lever (9) at transmission valve for speed control in NEUTRAL (shown in Detail C) and adjust rod (16) for free fit of bolt in lever (18).
3. Position lever (10) at transmission valve for direction control in FORWARD (shown in Detail C) and adjust rod (15) to obtain a free fit of bolt in lever (17).
Transmission Control Linkage
(9) Speed control lever. (10) Direction control lever. (14) Shift lever.
Parking Brake Adjustment Procedure
NOTE: While the Type 1 and Type 2 linkages look somewhat different, the adjustment procedures are the same.
1. With parking brake lever (4) located as shown in the brake ON position (lever down), adjust rod (2) until end fits freely in lever (4).
2. Tighten locknut on rod (2) to a torque of 5 ± 0.5 N·m (4 ± .5 lb ft).
3. Adjust rod assembly (5) to the specified length. Install the adjusted rod assembly.
NOTE: Do not change the length of rod assembly (5) in further adjustments.
4. Disconnect rod assembly (8) at its upper end.
5. Pull up on lever (13) until resistance is felt. Do not stretch spring can on rod (8) (if equipped). Adjust the length of rod assembly (8) until pin fits freely through upper rod end (7). Then turn upper rod end (7) down two full turns (shorten) and install rod assembly (8).
6. To check parking brake adjustment, install a 0 to 4000 kPa (0 to 600 psi) pressure gauge on either the right or left brake pressure tap.
7. Start the engine and run it at LOW IDLE.
8. With parking brake lever (4) in the brake ON position (lever down), the pressure gauge must read less than 300 kPa (44 psi). If the pressure is greater than 300 kPa (44 psi), make rod assembly (8) shorter and check the pressure again.
9. Rotate parking brake lever (4) to the brake OFF position (lever up). The pressure gauge must read 2750 ± 150 kPa (400 ± 22 psi). If the pressure reading is low, make rod assembly (8) longer and check the pressure again.
10. After adjusting the linkage in Steps 8 and 9, attach a 0 to 4000 kPa (0 to 600 psi) gauge to the P1 pressure tap on the transmission. With the engine running at LOW IDLE, move parking brake lever (4) from brake ON to brake OFF (full lever travel each way). The P1 pressure should read exactly the same with the parking brake ON or OFF.
11. If the P1 pressure is not the same with the parking brake ON as it is with the parking brake OFF, the parking brake valve is leaking oil and the linkage must be adjusted further using the following instructions:
a. If P1 with the parking brake OFF is less than P1 with the parking brake ON, lengthen rod assembly (8).
b. If P1 with the parking brake ON is less than P1 with the parking brake OFF, shorten rod assembly (8).
12. If linkage adjustments are made in Step 11, repeat the pressure checks in Steps 7, 8, and 9. Readjust as necessary until all pressures are met.
Transmission Control Linkage
(15) Rod assembly. (16) Rod assembly. (17) Lever. (18) Lever.
Steering Clutch and Brake and Foot Brake Controls Linkage
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Steering clutch and brake control linkage adjustments should be made only with the engine OFF. Accidental disengagement of the parking brake while the engine is running could cause sudden machine movement and personal injury. |
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Torque for all 3/8 in. locknuts (jam nuts) that hold rod ends in place on the rod ... 14 ± 4 N·m (10 ± 3 lb ft)
NOTE: All rod assembly measurements must be made in a straight line between the centerlines of the rod end mounting holes.
(6) Assembled length of rod assembly ... 266 ± 1.5 mm (10.47 ± .06 in)
(9) Assembled length of rod assembly ... 441 ± 1.0 mm (17.36 ± .04 in)
(14) Torque for four bolts ... 47 ± 4 N·m (35 ± 3 lb ft)
Steering Clutch and Brake Linkage Adjustment Procedure
1. Install rod assembly (6) after it has been adjusted to correct length.
2. Make adjustments to rod assemblies (10) and (11) so there is a clearance between clutch levers (1) and (2) and platform opening (3) (shown in View A-A) of ... 7.0 ± 1.0 mm (.28 ± .04 in)
3. Adjust bumpers (4) to dimension A of ... 1.0 + 1.0 - 0.5 mm (.04 + .04 - .02 in)
Steering Clutch and Brake and Foot Brake Controls Linkage
(1) Steering clutch control lever. (2) Steering clutch control lever. (3) Platform opening. (4) Bumper. (5) Brake pedal. (6) Rod assembly. (7) Stop bolt. (8) Locknut. (9) Rod assembly. (10) Rod assembly. (11) Rod assembly. (12) Lever. (13) Rod assembly. (14) Bolt.
Brake Pedal Linkage Adjustment Procedure
1. Assemble brake pedal (5) on shaft so that front edge of pedal tread plate is dimension (B) of 146 mm (5.75 in) from the floor plate. This is one spline tooth down from position where timing mark on shaft is aligned with centerline of slot in pedal.
2. Install rod assembly (9) after it has been adjusted to correct length.
3. Disconnect rod assembly (13) from lever (12).
4. Rotate lever (12) counterclockwise (toward the front of the tractor) until resistance is felt.
5. Adjust the length of rod assembly (13) to obtain a free fit in lever (12).
6. Push the brake pedal down until lever (12) stops.
7. With the brake pedal fully pushed down, adjust bolt (7) until the head contacts the brake pedal.
8. Release the brake pedal, and turn bolt (7) an additional 1/2 turn out. Tighten locknut (8).
NOTE: To bring pedal closer to operator, align timing mark on shaft with centerline of slot in pedal. This gives dimension (B) of 176 mm (6.9 in).
Clutch Levers and Spring Assemblies Adjustment Procedure
Clutch Lever and Spring Assembly (Part of Steering and Brake Control Valve)
(1) Roller. (2) Cover. (3) Plunger. (4) Clutch lever. (5) Spring assembly. (6) Bolt.
NOTE: This adjustment should be made before any system pressures are adjusted.
1. Remove cover (2) and loosen bolt (6).
2. Move clutch lever (4) until roller (1) is in contact with, but not depressing, plunger (3).
3. Move spring assembly (5) until the pin of the spring assembly is in the front detent of the clutch lever (as shown in the illustration).
4. Tighten bolt (6).
5. Do Steps 2 through 4 for the other clutch lever.
6. Install cover (2).