- Excavator:
- 320C (S/N: MAB1-UP; AMC1-UP)
- 325C (S/N: BKW1-UP; BLX1-UP)
- Work Tool:
- Thumb (S/N: THC1-UP; THD1-UP)
Introduction
This Special Instruction contains the procedure for installing 418-0312 Connecting Lines Gp . The machine must be equipped with auxiliary hydraulic lines on the stick. For additional information about the installation of the connecting lines, consult the local Cat dealer.
Safety
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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manuals. Failure to follow the instructions or heed the warnings could result in injury or death. Contact your Cat dealer for replacement manuals. Proper care is your responsibility. |
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Personal injury or death can result from improperly checking for a leak. Always use a board or cardboard when checking for a leak. Escaping air or fluid under pressure, even a pin-hole size leak, can penetrate body tissue causing 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. |
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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| NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates. |
Required Tools
| Required Tool | |||
|---|---|---|---|
| Tool | Qty | Part Number |
Description |
| F | 1 | 311-1362 | Vacuum Cap |
Machine Preparation
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| Illustration 1 | g03168576 |
Service arrangement of an Excavator | |
- Clear all personnel from the machine and from the area around the machine.
- Start the engine.
- Set the engine speed dial at "10".
- Place the hydraulic activation control lever in the LOCKED arrangement.
- Arrange the machine on level ground. Check the visibility and adjust the mirrors for the best vision close to the machine.
- Arrange the machine into the servicing arrangement. Refer to Illustration 1.
- Stop the engine.
- Release the hydraulic system pressure. Refer to the Operation and Maintenance Manual, "System Pressure Release".
- Place the hydraulic activation control lever in the UNLOCKED arrangement.
- Turn the engine start switch to the OFF arrangement.
- Attach tooling (F) onto the hydraulic tank. Attach an air supply hose onto the assembly. Apply 276 to 414 kPa (40 to 60 psi). This procedure will pull a vacuum on the hydraulic system.
- Precede to the Connecting Lines Gp being installed on the machine.
Required Parts
| 418-0312 Connecting Lines Gp | |||
|---|---|---|---|
| Item | Qty | Part Number |
Description |
| 1 | 2 | 126-8790 | Manual Valve As |
| 2 | 2 | 376-7218 | Plate |
| 3 | 1 | 385-1044 | Hydraulic Block Rt |
| 4 | 2 | 385-1046 | Spacer |
| 5 | 1 | 385-1176 | Hydraulic Block Lt |
| 6 | 2 | 421-8416 | Hose As |
| 7 | 4 | 1P-3704 | Rectangular Seal |
| 8 | 4 | 3D-2824 | O-Ring Seal |
| 9 | 2 | 4J-0520 | O-Ring Seal |
| 10 | 4 | 5P-8245 | Hard Washer |
| 11 | 2 | 5P-9436 | Plug |
| 12 | 8 | 5S-7382 | Bolt |
| 13 | 8 | 6V-5839 | Washer |
| 14 | 4 | 6V-7744 | Locknut |
| 15 | 4 | 6V-8336 | Bolt |
| 16 | 4 | 6V-8716 | Connector |
| 17 | 4 | 6V-9746 | O-Ring Seal |
| 18 | 4 | 7M-8485 | O-Ring Seal |
| 19 | 8 | 7X-2549 | Bolt |
| 20 | 4 | 8C-3206 | Half Flange |
| 21 | 4 | 8T-0644 | Bolt |
| 22 | 8 | 8T-4223 | Hard Washer |
| 23 | 8 | 8T-4896 | Hard Washer |
| 24 | 2 | 8T-6451 | Elbow |
Procedure to Install the Connecting Lines Gp
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| Illustration 2 | g03172117 |
Left side view of stick (A) Existing Hose (1) 126-8790 Manual Valve As (5) 385-1176 Hydraulic Block (6) 421-8416 Hose As | |
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| Illustration 3 | g03200940 |
Left side close-up view of manual valve assembly (1) 126-8790 Manual Valve As (2) 376-7218 Plate (4) 385-1046 Spacer (5) 385-1176 Hydraulic Block (7) 1P-3704 Rectangular Seal (8) 3D-2824 O-Ring Seal (10) 5P-8245 Hard Washer (11) 5P-9436 Plug (13) 6V-5839 Washer (14) 6V-7744 Locknut (15) 6V-8336 Bolt (16) 6V-8716 Connector (17) 6V-9746 O-Ring Seal (18) 7M-8485 O-Ring Sea l (19) 7X-2549 Bolt (21) 8T-0644 Bolt (22) 8T-4223 Hard Washer (24) 8T-6451 Elbow | |
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| Illustration 4 | g03172136 |
Right side view of stick (A) Existing Hose (1) 126-8790 Manual Valve As (3) 385-1176 Hydraulic Block (6) 421-8416 Hose As | |
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| Illustration 5 | g03200998 |
Right side close-up view of manual valve assembly (1) 126-8790 Manual Valve As (2) 376-7218 Plate (3) 385-1176 Hydraulic Block (4) 385-1046 Spacer (7) 1P-3704 Rectangular Seal (8) 3D-2824 O-Ring Seal (10) 5P-8245 Hard Washer (11) 5P-9436 Plug (13) 6V-5839 Washer (14) 6V-7744 Locknut (15) 6V-8336 Bolt (16) 6V-8716 Connector (17) 6V-9746 O-Ring Seal (18) 7M-8485 O-Ring Sea l (19) 7X-2549 Bolt (21) 8T-0644 Bolt (22) 8T-4223 Hard Washer (24) 8T-6451 Elbow | |
- Install manual valve assembly (1) onto plate (2) using the following parts: two bolts (21), four washers (13) and two locknuts (14). Tighten to standard torque.
- Install O-ring seals (18) and connectors (16) on to manual valve assembly (1) .
Note: Do not tighten the following connections until all components are installed and arranged properly.
- Install plug (11) with O-ring seal (8) into the front of hydraulic block (5) on the left side lines.
Note: Use hydraulic block (3) on the right side lines.
- Install O-ring seal (8) onto elbow (24) and connect to hydraulic block (5) on the left side lines.
Note: Use hydraulic block (3) on the right side lines.
- Disconnect existing hose (A) and discard existing bolts. Reuse the half flanges. Install hydraulic block (5) using the following parts: two rectangular seals (7), four bolts (19) and four washers (22) on the left side lines. Arrange as shown in Illustration 3.
Note: Use hydraulic block (3) on the right side lines. Refer to Illustration 5.
- Install O-ring seals (17) into connectors (16) on manual valve assembly (1) and connect to elbow (24) .
- Mount manual valve assembly (1) to the stick by installing plate (2) using the following parts: spacer (4), two bolts (15) and two washers (10). Arrange as shown in Illustrations 3 and 5.
- Connect hose (6) to connector (16) and route to the thumb cylinder. Arrange as shown in Illustrations 2 and 4.
- Connect hose (6) to the thumb cylinder using the following parts: O-ring seal (9), two half flanges (20), four bolts (12) and four washers (23) .
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| Illustration 6 | g03191838 |
Typical example. Close-up view of the connection to the hydraulic cylinder (9) 4J-0520 O-Ring Seal (12) 5S-7382 Bolt (20) 8C-3206 Half Flange (23) 8T-4896 Hard Washer | |
- Tighten all connections and hardware to standard torque.
- Open manual valve assemblies (1) on each side of the stick.
Note: When finished with the operation of manual valve assemblies (1) remove valve handle and place in the cab of the machine.
- Remove tooling (F) from the hydraulic tank.
- Test operation of the thumb cylinder.
- Inspect the fittings for hydraulic leaks.