Bench Test Procedure for a 773F, 773G, 775F, and 775G Off-Highway Truck Transmission {3030, 3073} Caterpillar

Off-Highway Truck/Tractor

773F (S/N: EED1-UP)

Quarry Truck

773G (S/N: MWH1-UP; JWS1-UP; T5S1-UP; T5T1-UP)

775F (S/N: EYG1-UP; DLS1-UP)

775G (S/N: T5F1-UP; RFM1-UP; MJS1-UP; T5W1-UP)

Introduction

© 2019 Caterpillar All Rights Reserved. This guideline is for the use of Caterpillar Dealers only. Unauthorized use of this document or the proprietary processes therein without permission may be violation of intellectual property law. Information contained in this document is considered Caterpillar: Confidential Yellow.

This special instruction contains the necessary information that is required to bench test a specific transmission arrangement. Refer to Table 2 for the correct arrangements. Bench testing the transmission ensures correct assembly and operation of the component. Rotating a transmission provides the most conclusive evaluation. Testing allows the dealer to ensure that the transmission will operate properly in the machine. The specifications in this guideline are specific to bench testing the component. Every effort has been made to provide the most current information that is known to Caterpillar. Continuing improvement and advancement of product design might have caused changes to your product which are not included in this publication. This guideline must be used with the latest technical information that is available from Caterpillar.

For technical questions when using this document, work with your Dealer Technical Communicator (TC).

To report suspected errors, inaccuracies, or suggestions regarding the document, submit a form for feedback in the Service Information System (SIS Web) interface.

Canceled Part Numbers and Replaced Part Numbers

This document may include canceled part numbers and replaced part numbers. Use NPR on SIS for information about canceled part numbers and replaced part numbers. NPR will provide the current part numbers for replaced parts.

Important Safety Information

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Follow all safety warnings. Most accidents that involve product operation, maintenance, or repair are caused by failure to observe safety warnings. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. Personnel must be properly trained to perform maintenance, repair, or operate any machine. Safety precautions and warnings are provided this instruction and on Caterpillar products. These warnings should be observed before performing any procedures. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. The warnings in this publication and on the product are not all inclusive.

The hazards are identified by the “Safety Alert Symbol” which is followed by a “Signal Word” such as “DANGER”, “WARNING, or” “CAUTION”. The “WARNING” Safety Alert Symbol is shown in illustration below.

Illustration 2	g00008666

This safety alert symbol means:

Pay Attention!

Become Alert!

Your Safety is Involved.

The message that appears under the safety alert symbol explains the hazard.

Operations that may cause product damage are identified by "NOTICE" labels on the product and in this publication.

Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. The safety information in this document and the safety information on the machine are not all inclusive. Determine that the tools, procedures, work methods, and operating techniques are safe. Determine that the operation, lubrication, maintenance, and repair procedures will not damage the machine. Also, determine that the operation, lubrication, maintenance, and repair procedures will not make the machine unsafe.

The information, the specifications, and the illustrations that exist in this guideline are based on information which was available at the time of publication. The specifications, torques, pressures, measurements, adjustments, illustrations, and other items can change at any time. These changes can affect the service that is given to the product. Obtain the complete, most current information before you start any job. Caterpillar dealers can supply the most current information.

Collecting The Test Data

Since conditions vary for each test bench, use the data that is collected from your test bench. The collected data is used to compare test results. The data should be collected and maintained by the operator.

Data from each transmission arrangement is collected and stored. Averages from each transmission arrangement are often used to compare values on portions of transmission tests. Always compare data that is collected from the same transmission arrangement that is being tested. Averages for the last 20 transmission arrangements should be maintained.

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Personal injury or death can result from escaping fluid under pressure. Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak.

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Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin.

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Personal injury or death can result from not following the proper procedures. To avoid the possibility of injury or death, follow the established procedure.

Tools Needed

Note: Pressures will be sensitive to tooling setup. The diameter of the hose, the diameter of a fitting, and extra filtering can affect pressure. The required tools that are listed in Table 3 were used to develop this test procedure.

FT Drawings

Illustration 3	g06056238
FT-3211 Make from 304-9164 Adapter Cable As by swapping pins (6) with (10) and pins (7) with (11) on the 7X-6222 24-pin connector and relabeling harness.

Installation Procedure

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1. Install Tooling (A).
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2. Use a hoist to install the transmission on the test bench. The weight of the transmission is 1111.30 kg (2450 lb).
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3. Install Tooling (B) to the input yoke.
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4. Install Tooling (C) on Tooling (B).
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5. Install Tooling (D) on Tooling (C).

   Note: Tooling (D) will adapt to the small drive shaft. If you are using the large drive shaft, install Tooling (E) on Tooling (D).

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6. Align the transmission with the input drive shaft.

7. Connect the input drive shaft to Tooling (D).
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8. Install the drive shaft guard.
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9. Tighten all four castle nuts and jack bolts.
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10. Install Tooling (F) to prevent movement during testing.
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11. Install Tooling (G).
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12. Install Tooling (H) to the output shaft of the transmission.
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    Illustration 15	g02691042
    Typical Example

13. Use a hoist to install Tooling (J) on Tooling (H). The weight of Tooling (J) is 121 kg (267 lb).

    Note: Refer to Special Instruction, SEHS8763, "Assembly and Operation of 1U-5999 Spindle Group Used for Testing Transmissions on Hydraulic Test Bench" for additional information.

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    Illustration 16	g02691064
    Typical Example

14. Loosen bolt (1).
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    Typical Example

15. Use bolt (2) to adjust Tooling (J) inward until Tooling (J) contacts the carrier.
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16. Tighten the collet on Tooling (J) to connect Tooling (J) to Tooling (H).

17. Adjust Tooling (J) to provide a 3 - 4 mm (0.12 - 0.16 inch) gap spacing between Tooling (J) and the carrier.

18. Tighten bolt (1).
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19. Remove threaded plug (3).
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20. Remove cover (4).
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21. Install Tooling (K).
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22. Install Tooling (L).
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23. Install Tooling (M).
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    (5) Transmission Supply Oil

24. Connect Hose Assembly (5) from the pressurized flow meter on the test bench to Tooling (K).
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25. Connect Hose Assembly (6) from Tooling (L) to the No. 2 flow meter inlet.
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    Lube (in)

26. Connect Hose Assembly (7) from the No. 2 flow meter outlet to Tooling (M).

    Note: The No. 2 flow meter measures lube flow.

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    Illustration 27	g02691547
    (8) Spindle Lubrication Oil Supply

27. Connect lube line (8) from the test bench to Tooling (J). Maintain an oil pressure of 275 kPa (40 psi).
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    Illustration 28	g02691561
    (9) Main Relief Valve Pressure

28. Connect a pressure gauge to test port (9).
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    (10) Torque Converter Inlet Pressure

29. Connect a pressure gauge to test port (10).
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    (11) Lubrication Pressure

30. Connect a pressure gauge to test port (11).
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    Illustration 31	g02691642
    (12) "No. 5" Clutch Pressure (13) "No. 6" Clutch Pressure (14) "No. 7" Clutch Pressure (15) "No. 4" Clutch Pressure (16) "No. 3" Clutch Pressure (17) "No. 2" Clutch Pressure (18) "No. 1" Clutch Pressure

31. Connect a pressure gauge to each of the clutch pressure taps (12), (13), (14), (15), (16), (17), and (18).
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    Illustration 32	g06056263

32. Remove harness (19) for arrangement 248-2036.
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    Illustration 33	g06056264

33. Install Tooling (N).
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    Illustration 34	g02691837

34. Install Tooling (N) for arrangement 326-4820.
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    Illustration 35	g02691896
    Tooling N

35. Install Tooling (N). Refer to Tool Operating Manual, NEHS0966 for the correct operating instructions.

Test Procedure

TA3 Navigation

1. Select “Off-Highway Trucks”.

2. Select “773F” or “775F”.

Harness Test

1. Make sure that the harness is properly connected.

2. Use Tooling (N) to perform the harness test.

3. Record the values in Table 6.

   Note: Do not continue testing until Harness Test passes.

Start Checks

Note: Refer to Testing and Adjusting, RENR8283, "773F Off-Highway Truck and 775F Off-Highway Truck Power Train" or Testing and Adjusting, KENR9958, "773G Off-Highway Truck and 775G Off-Highway Truck Power Train" for the correct adjusting procedures.

1. If you are using SAE 10W oil, warm the oil to 50 °C (125 °F). If you are using Mobil DTE11 oil, warm the oil to 34 °C (95 °F). Maintain this temperature during the test.

2. Adjust the input flow to 170 ± 4 L/min (50 ± 1 US gpm).
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3. With the transmission in the NEUTRAL position, rotate the input shaft in a counterclockwise direction. Adjust the input rotation to 700 ± 10 rpm.

   Note: The input shaft will be rotated in a counterclockwise direction during this test. The direction is determined as you face the drive motor of the test bench.

4. Shift the transmission through all gears to eliminate air from the transmission controls.

5. Confirm the correct clutch engagement with Table 4.
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   Table 4

   Clutch Engagement Check
   Gear	Cl 1	Cl 2	Cl 3	Cl 4	Cl 5	Cl 6	Cl 7
   N				X
   R	X						X
   F1	X					X
   F2			X			X
   F3		X				X
   F4			X		X
   F5		X			X
   F6			X	X
   F7		X		X

6. Check for lockup or excessive drag in all speed ranges.

7. Stop the input rotation.

Lube Check

1. Adjust the input flow to 170 ± 4 L/min (50 ± 1 US gpm). Maintain this flow during this test.

2. Shift the transmission to the FORWARD 1 position.

3. Adjust the input rotation to 1300 ± 20 rpm.

4. Lubrication pressure should be approximately 48 ± 21 kPa (7 ± 3 psi). Record the lubrication pressure in Table 7.

5. Record the lube flow in Table 7.

6. Adjust the input rotation to 700 ± 10 rpm.

7. Shift the transmission through positions FORWARD 2, FORWARD 3, FORWARD 4, FORWARD 5, FORWARD 6, FORWARD 7, and REVERSE. Repeat Step 2 through Step 6 for each gear range.

   Note: Only shift the transmission to the REVERSE position at an input speed of less than 600 rpm.

   Note: Always shift the transmission back to NEUTRAL when shifting between FORWARD and REVERSE.

8. Stop the input rotation.

9. Stop the input flow.

Clutch Pressure Check (High Idle)

1. Adjust the input flow to 170 ± 4 L/min (50 ± 1 US gpm).

2. Adjust the input rotation to 700 ± 10 rpm.

3. Shift the transmission to FORWARD 1.

4. Adjust the input rotation to 1950 ± 25 rpm.

5. Record the clutch pressures in Table 9.

6. Verify that the clutch pressures match the values in Table 8.

7. Repeat Steps 2 through 6 for FORWARD 2, FORWARD 3, FORWARD 4, FORWARD 5, FORWARD 6, FORWARD 7, and REVERSE.

   Note: Always shift the transmission back to NEUTRAL when shifting between FORWARD and REVERSE.

Clutch Leakage Check

1. Adjust the input flow to 170 ± 4 L/min (50 ± 1 US gpm).

2. Shift the transmission to the NEUTRAL position.

3. Adjust the input rotation to 1950 ± 25 rpm.

4. Record the supply pressure in Table 11. The correct supply pressure is 3103 ± 35 kPa (450 ± 5 psi).

5. Record the input flow in Table 11.

6. Record the lube flow in Table 11.

7. The leakage is obtained by subtracting the lube flow from the input flow.

8. Record the calculation in Table 11.

9. Adjust the input rotation to 700 ± 10 rpm.

10. Shift the transmission through positions FORWARD 1, FORWARD 2, FORWARD 3, FORWARD 4, FORWARD 5, FORWARD 6, FORWARD 7, and REVERSE. Repeat Step 3 through Step 9 for each gear range.

    Note: Always shift the transmission back to NEUTRAL when shifting between FORWARD and REVERSE.

11. Verify that the clutch leakages match the values in Table 10.

Contamination Control

1. Take an oil sample of the test bench oil supply. Oil contamination must be maximum ISO 16/13.

2. Record the results in Table 12.

3. Remove the transmission from the test bench if the test bench oil supply is within specifications.

Transmission Bench Test Data Sheet

Harness Test

Lube Check

Clutch Pressure Check (High Idle)

Clutch Leakage Check

Contamination Control