- Wheel Tractor-Scraper:
- 621H (S/N: DBK1-UP; HKK1-UP; NYY1-UP; EAZ1-UP)
- 621K (S/N: WTA1-UP; WTE1-UP; WTL1-UP; WTP1-UP)
- 623H (S/N: EJD1-UP; DBF1-UP)
- 623K (S/N: WTB1-UP; WTM1-UP)
- 627H (S/N: LCT1-UP; DBW1-UP)
- 627K (S/N: WTC1-UP; WTN1-UP)
- 621K (S/N: WTA1-UP; WTE1-UP; WTL1-UP; WTP1-UP)
Introduction
| Revision | Summary of Changes in SEBF3617 |
| 05 | Updated Table 3. |
| 04 | Added serial number prefixes. |
| 03 | Updated Title. |
| 02 | Added model 621K, 623K, and 627K. |
© 2015 Caterpillar All Rights Reserved. This guideline is for the use of Cat 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 in order 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 questions or additional information concerning this guideline, submit a form for feedback in the Service Information System. In order to address an urgent issue, use the following resources in order to communicate your request to Caterpillar Repair Process Engineering:
- Caterpillar Dealer Technical Communicator
- Dealer Solution Network
- Caterpillar Technical Representative
- Knowledge Network
| Machine Model | Transmission Arrangement |
| 621H, 621K, 627H, 627K | 315-4721 |
| 623H, 623K | 315-4723 |
Collecting the Test Data
Since conditions vary for each test bench, it is important to 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 in order 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. |
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| Illustration 1 | g02139237 |
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.
Tools Needed
Note: Pressures will be sensitive to tooling setup. The diameter of the hose, the diameter of a fitting, and additional filtering can affect pressure. The required tools that are listed in Table 3 were used in order to develop this test procedure.
| Required Tools | |||
|---|---|---|---|
| Tool | Part Number | Part Description | Qty |
| A | 1U-9584 | Rail as | 2 |
| 1U-9586 | Support | 2 | |
| FT-2277 | Swivel Support | 2 | |
| FT-2278 | Swivel Head | 2 | |
| 1U-9585 | Block Gp | 1 | |
| B | 138-7574 | Link Bracket | 1 |
| 0L-1178 | Bolt (3/4-10X2.0 inch) | 1 | |
| 5P-8248 | Hard Washer | 1 | |
| D | 1U-6719 | Shaft As (Drive Adapter) | 1 |
| E | 136-3647 | Adapter Plate | 1 |
| 0S-1588 | Bolt (3/8-16X1.25 inch) | 4 | |
| 3B-4506 | Lockwasher | 4 | |
| F | 1U-9131 | Drive Adapter Key (1) |
1 |
| G | 1U-9722 | Load Binder as (Ratchet type) | 2 |
| H | 4C-4696 | Adapter (Splined) | 1 |
| J | 4C-4695 | Adapter Ring | 1 |
| K | 4C-4700 | Adapter As (Spindle) | 1 |
| 5P-5421 | Bolt (1/2-13X12.0 inch) | 1 | |
| L | 1U-5999 | Spindle Gp | 1 |
| 1A-1460 | Bolt (1/2-13X2.0 inch) | 1 | |
| M | FT-1268 | Adapter Plate | 1 |
| 7B-6868 | O-Ring Seal | 1 | |
| 5L-3785 | Pipe Nipple | 1 | |
| 5B-7660 | Pipe Elbow | 1 | |
| 3D-2189 | Pipe Nipple | 1 | |
| 3B-6499 | Reducing Bushing | 1 | |
| 1U-9879 | Fitting As | 1 | |
| 0S-1569 | Bolt (5/8-11X4 inch) | 4 | |
| 4B-5275 | Washer | 4 | |
| 1D-4720 | Full Nut | 4 | |
| N | FT-1268 | Adapter Plate | 1 |
| 3B-7820 | Pipe Nipple | 1 | |
| 1L-0254 | Pipe Elbow | 2 | |
| 8C-9024 | Fitting As (Plain) | 2 | |
| P | 9U-7446 | Adapter | 1 |
| 1U-8301 | Flange | 1 | |
| 6V-3965 | Fitting | 1 | |
| 8C-9024 | Fitting As (Plain) | 1 | |
| 1P-4579 | Half Flange | 2 | |
| 1A-5822 | Bolt (1/2-13X2.75 inch) | 4 | |
| 4J-0524 | O-Ring Seal | 1 | |
| 7M-8485 | O-Ring Seal | 1 | |
| 3J-1907 | O-Ring Seal | 1 | |
| Q | 9U-7446 | Flange | 1 |
| 1U-8301 | Flange | 1 | |
| 6V-3965 | Fitting | 1 | |
| 8C-9024 | Fitting As (Plain) | 1 | |
| 1P-4579 | Half Flange | 2 | |
| 1A-5822 | Bolt (1/2-13X2.75 inch) | 4 | |
| 4J-0524 | O-Ring Seal | 1 | |
| 7M-8485 | O-Ring Seal | 1 | |
| 3J-1907 | O-Ring Seal | 1 | |
| S | 1U-8304 | Fitting | 1 |
| 9U-7445 | Adapter | 1 | |
| 1P-4578 | Half Flange | 1 | |
| 8C-9024 | Fitting As (Plain) | 1 | |
| 6V-3965 | Fitting As (Quick Disconnect) | 4 | |
| 4J-0522 | O-Ring Seal | 4 | |
| 7M-8485 | O-Ring Seal | 1 | |
| 3J-1907 | O-Ring Seal | 1 | |
| 1D-4703 | Bolt (7/16-14X2.5 inch) | 4 | |
| 8T-5360 | Hard Washer | 4 | |
| T | 120-6843 | Ball Valve | 1 |
| 8C-9024 | Fitting As (Plain) | 1 | |
| 8C-9025 | Quick Coupler | 1 | |
| 3B-7749 | Fitting | 1 | |
| U | 1U-8301 | Fitting | 1 |
| 9U-7445 | Adapter | 1 | |
| 1P-4578 | Half Flange | 1 | |
| 8C-9024 | Fitting As (Plain) | 1 | |
| 6V-3965 | Fitting As (Quick Disconnect) | 1 | |
| 4J-0522 | O-Ring Seal | 1 | |
| 7M-8485 | O-Ring Sea | 1 | |
| 3J-1907 | O-Ring Sea | 1 | |
| 1D-4703 | Bolt (7/16-14X2.5 inch) | 4 | |
| 8T-5360 | Hard Washer | 4 | |
| X | FT-3185 | Adapter Cable As | 1 |
| 277-2362 | Transmission Analyzer Tool Gp | 1 | |
| 306-0397 | Extension Cable | 1 | |
| Y | 1U-9359 | Drive Adapter (2) | 1 |
| ( 1 ) | This drive adapter is used with the small drive shaft. |
| ( 2 ) | This drive adapter is used with the large drive shaft. |
Installation Procedure
- Install Tooling (A) on the rails of the test bench, as shown.
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| Illustration 2 | g02612698 |
- Install Tooling (B) on the Transmission.
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| Illustration 3 | g02612877 |
- Use a hoist to install the transmission on the test bench. The weight of the transmission is 1211 kg (2670 lb).
 | |
| Illustration 4 | g02612917 |
- Install Tooling (D) .
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| Illustration 5 | g02612956 |
- Install Tooling (E) to Tooling (D) .
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| Illustration 6 | g02613036 |
- Install Tooling (F) on Tooling (E) .
Note: Tooling (F) will adapt to the small drive shaft. If, you are using the large drive shaft it will be necessary to install Tooling (Y) on Tooling (E) .
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| Illustration 7 | g02613057 |
- Align the transmission with the input drive shaft.
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| Illustration 8 | g02613062 |
- Connect the input drive shaft to Tooling (F) .
- Install Tooling (G) to the input and output end of the transmission.
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| Illustration 9 | g02615280 |
- Remove bolts (1) .
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| Illustration 10 | g02615198 |
- Install Tooling (H) .
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| Illustration 11 | g02614217 |
- Install Tooling (J) .
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| Illustration 12 | g02614240 |
- Install Tooling (K) .
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| Illustration 13 | g02614278 |
- Install Tooling (L) on Tooling (K) .
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| Illustration 14 | g02615256 |
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.
- Loosen bolt (2). Use bolt (3) to adjust Tooling (L) inward.
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| Illustration 15 | g02615260 |
- Tighten the collet on Tooling (L) in order to connect Tooling (K) to Tooling (H) .
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| Illustration 16 | g02615301 |
- Tighten bolt (3) only after you adjust Tooling (L) .
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.
- Install Tooling (M) .
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| Illustration 17 | g02615319 |
- Install Tooling (N) .
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| Illustration 18 | g02614316 |
- Install Tooling (P) .
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| Illustration 19 | g02615337 |
- Install Tooling (Q) .
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| Illustration 20 | g02615348 |
- Install Tooling (S). Connect Tooling (T) to Tooling (S) .
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| Illustration 21 | g02615350 |
- Install Tooling (U) .
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| Illustration 22 | g02615360 |
- Connect hose assembly (4) from the pump supply to Tooling (M) .
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| Illustration 23 | g02614397 |
- Connect hose assembly (5) from Tooling (N) to the drain.
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| Illustration 24 | g02614799 |
- Connect hose assembly (6) from the No. 2 flow meter inlet to Tooling (T) .
Note: The No. 2 flow meter will measure the torque converter inlet oil that is returning to the test bench.
 | |
| Illustration 25 | g02614818 |
- Connect hose assembly (7) from the outlet of the No. 2 flow meter to Tooling (U) .
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| Illustration 26 | g02614837 |
- Connect hose assembly (20) to Tooling (P) .
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| Illustration 27 | g02615378 |
- Connect hose assembly (21) to Tooling (Q) .
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| Illustration 28 | g02615404 |
- Connect lube line (14) from the test bench to Tooling (L). Maintain an oil pressure of 275 kPa (40 psi).
 | |
| Illustration 29 | g02614840 |
- Connect a pressure gauge to pressure taps (10), (11), (12), (13), (14), (15), (16), (17), and (18) as shown.
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| Illustration 30 | g02614919 |
(10) #4 Clutch (11) #5 Clutch (12) #6 Clutch (13) #7 Clutch (14) #3 Clutch (15) #1 Clutch (16) #2 Clutch (17) Pump Pressure (18) Torque Converter Inlet Pressure | |
Note: If you are using individual pressure gauges to measure the pressures, refer to Table 3 for the correct pressure gauges.
- Connect pressure gauge (19) to Tooling (S) .
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| Illustration 31 | g02618396 |
- Connect Tooling (X) to the transmission.
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| Illustration 32 | g02615124 |
- Connect Tooling (X) to a power source. Refer to Tool Operating Manual, NEHS0644 for the correct operating instructions.
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| Illustration 33 | g01437601 |
Tooling (X) | |
Test Procedure
Solenoid Test
- Make sure that the harness is properly connected.
- Use Tooling (X) to perform the solenoid test.
- Record the values in Table 7.
Preliminary Checks
- The preferred oil is SAE 10 oil viscosity grade. Warm SAE 10 oil viscosity grade to 50 °C (125 °F). Maintain this temperature for the duration of the test.
Note: Refer to Systems Operation Testing and Adjusting, KENR8878, "621H, 623H & 627H WHEEL TRACTOR SCRAPERS POWER TRAIN ".
- With the transmission in the NEUTRAL position, rotate the input shaft in a CLOCKWISE direction. Adjust the input rotation to 700 ± 5 rpm.
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| Illustration 34 | g02615057 |
- Shift the transmission through all speed ranges in order to eliminate air from the transmission controls.
- Shift the transmission until all clutch fills are consistent.
- The minimum transmission lubrication pressure should be 13.8 kPa (2.0 psi).
- Record the value in Table 8.
- Adjust the input rotation to 0 rpm.
- Use the following procedure to test the transmission.
Torque Converter Inlet Relief Valve
- Shift the transmission to the FORWARD 1 position.
- Adjust the input rotation until the outlet flow for the cooler outlet is 38.0 ± 0.2 L/min (10.00 ± 0.05 US gpm).
- Use Tooling (S) in order to momentarily block the flow at the torque converter outlet.
- The torque converter inlet pressure must be 930 ± 100 kPa (135 ± 15).
- Record the value in Table 9.
Lube Circuit Check
- Shift the transmission to the REVERSE position.
- Adjust the input rotation until the output flow is 57 ± 0.4 L/min (15 ± .1 US gpm).
- The transmission lubrication pressure must be 79 ± 8 kPa (11.5 ± 1.2 psi).
- Record the value in Table 10.
- Stop the input rotation.
Pressure Check (Low Idle)
- Adjust the input rotation to 700 ± 5 rpm in the NEUTRAL position.
- The minimum supply pressure is 2690 kPa (390 psi) in all speed ranges.
- Shift the transmission through ranges NEUTRAL, REVERSE, FORWARD 1, FORWARD 2, FORWARD 3, FORWARD 4, FORWARD 5, FORWARD 6, FORWARD 7, and FORWARD 8positions.
- Record the clutch pressure for each gear range in Table 11.
- Record the Low Idle Scavenge pump flow and pressure in Table 13
- Verify that the clutch pressures match the values in Table 4.
Show/hide table
Table 4 Pressure Check (Low Idle) Station "A" "B" "C" "E" "F" "G" "H" Clutch No. 1 (1) No. 2 (1) No. 7 (1) No. 5 (1) No. 4 (1) No. 6 (1) No. 3 (1) Speed Range Engaged Clutches Pressure NEUTRAL 4
2000 kPa (290 psi)REVERSE 1 and 7
2688 kPa (390 psi)
2758 kPa (400 psi)FORWARD 1 1 and 6
2688 kPa (390 psi)
2758 kPa (400 psi)FORWARD 2 1 and 5
2688 kPa (390 psi)
2758 kPa (400 psi)FORWARD 3 3 and 6
2758 kPa (400 psi)
1793 kPa (260 psi)FORWARD 4 2 and 6
2000 kPa (290 psi)
2758 kPa (400 psi)FORWARD 5 3 and 5
2758 kPa (400 psi)
1793 kPa (260 psi)FORWARD 6 2 and 5
2000 kPa (290 psi)
2758 kPa (400 psi)FORWARD 7 3 and 4
1930kPa (280 psi)
1793 kPa (260 psi)FORWARD 8 2 and 4
2000 kPa (290 psi)
1930kPa (280 psi)Show/hide table( 1 ) The tolerance is + 240 − 100 kPa (+ 35 − 15 psi). ( 1 ) The tolerance is ± 280 kPa (± 41 psi).
Pressure Check (High Idle)
- Adjust the input rotation to 700 ± 5 rpm with the transmission in the NEUTRAL position.
- The maximum supply pressure is 3310 kPa (480 psi) in all speed ranges.
- Adjust the input rotation to 1900 ± 10 rpm.
- Record the clutch pressure in Table 12.
- Adjust the input rotation to 700 ± 5 rpm.
- Shift the transmission through positions NEUTRAL, REVERSE, FORWARD 1, FORWARD 2, FORWARD 3, FORWARD 4, FORWARD 5, FORWARD 6, FORWARD 7, and FORWARD 8 positions. Repeat Steps 3 through 5 for each gear range.
- Record the High Idle Scavenge pump flow and pressure in Table 13
- Adjust the input rotation to 700 ± 5 rpm.
- Verify that the clutch pressures match the values in Table 5.
| Pressure Check (High Idle) | ||||||||
| Station | "A" | "B" | "C" | "E" | "F" | "G" | "H" | |
| Clutch | No. 1 (1) | No. 2 (1) | No. 7 (1) | No. 5 (1) | No. 4 (1) | No. 6 (1) | No. 3 (1) | |
| Speed Range | Engaged Clutches | Pressure | ||||||
| NEUTRAL | 4 | 2000 kPa (290 psi) |
||||||
| REVERSE | 1 and 7 | 2757 kPa (400 psi) |
3033 kPa (440 psi) |
|||||
| FORWARD 1 | 1 and 6 | 2757 kPa (400 psi) |
3034 kPa (440 psi) |
|||||
| FORWARD 2 | 1 and 5 | 2757 kPa (400 psi) |
3020 kPa (440 psi) |
|||||
| FORWARD 3 | 3 and 6 | 3034 kPa (440 psi) |
1930 kPa (280 psi) |
|||||
| FORWARD 4 | 2 and 6 | 2170 kPa (315 psi) |
3034 kPa (440 psi) |
|||||
| FORWARD 5 | 3 and 5 | 3020 kPa (440 psi) |
2100 kPa (305 psi) |
|||||
| FORWARD 6 | 2 and 5 | 2206 kPa (320 psi) |
3020 kPa (440 psi) |
|||||
| FORWARD 7 | 3 and 4 | 2000 kPa (290 psi) |
2100 kPa (305 psi) |
|||||
| FORWARD 8 | 2 and 4 | 2137 kPa (310 psi) |
2000 kPa (290 psi) |
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| ( 1 ) | The tolerance is + 240 − 100 kPa (+ 35 − 15 psi). |
| ( 1 ) | The tolerance is ± 280 kPa (± 41 psi). |
Transmission Bench Test Data Sheet
| CATERPILLAR | Transmission Bench Test Data Sheet | Test Date: |
| Model: 621H, 623H, 627H | ||
| Work Order: | Serial No.: | |
Solenoid Test
| Solenoid Test | Solenoid 1 | Solenoid 2 | Solenoid 3 | Solenoid 4 | Solenoid 5 | Solenoid 6 | Solenoid 7 |
_______ ohms |
_______ ohms |
_______ ohms |
_______ ohms |
_______ ohms |
_______ ohms |
_______ ohms |
Preliminary Checks
| Transmission Lubrication Pressure | Input Speed (700 ± 5 rpm) | kPa (psi) |
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Torque Converter Inlet Relief Valve
| Torque Converter Inlet Relief Valve | Output Flow 38.00 ± 0.20 L/min (10.00 ± 0.05 US gpm) |
kPa (psi) |
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Lube Circuit Check
| Lube Circuit Check | Gear Range FORWARD 4 Output Flow 57 ± 0.4 L/min (15 ± .1 US gpm) |
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| Transmission Lubrication Pressure | kPa (psi) |
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Pressure Check (Low Idle)
| Pressure Check (High Idle) | Load Pistons are installed. Input Speed (700 ± 10 rpm) |
||||||||
| Gear Range | Active Clutches | A | B | C | E | F | G | H | |
| NEUTRAL | - | 4 | |||||||
| REVERSE | 1 | 7 | |||||||
| FORWARD 1 | 1 | 6 | |||||||
| FORWARD 2 | 1 | 5 | |||||||
| FORWARD 3 | 3 | 6 | |||||||
| FORWARD 4 | 2 | 6 | |||||||
| FORWARD 5 | 3 | 5 | |||||||
| FORWARD 6 | 2 | 5 | |||||||
| FORWARD 7 | 3 | 4 | |||||||
| FORWARD 8 | 2 | 4 | |||||||
Pressure Check (High Idle)
| Pressure Check (High Idle) | Input Speed (1900 ± 10 rpm) | ||||||||
| Gear Range | Active Clutches | A | B | C | E | F | G | H | |
| NEUTRAL | - | 4 | |||||||
| REVERSE | 1 | 7 | |||||||
| FORWARD 1 | 1 | 6 | |||||||
| FORWARD 2 | 1 | 5 | |||||||
| FORWARD 3 | 3 | 6 | |||||||
| FORWARD 4 | 2 | 6 | |||||||
| FORWARD 5 | 3 | 5 | |||||||
| FORWARD 6 | 2 | 5 | |||||||
| FORWARD 7 | 3 | 4 | |||||||
| FORWARD 8 | 2 | 4 | |||||||
| Scavenge Pump | Low Idle | High Idle |
_______ kPa (psi) |
_______ kPa (psi) |
|
_______ L\min-US gpm |
_______ L\min-US gpm |
Contamination Control
| ISO Particle Count | Sample the test bench oil supply. | ________/________Particle Count |
| ______________________________________ Technician |
______________________________________ Supervisor |