- Excavator:
- 374D (S/N: PJA1-UP; PAP1-UP; PAS1-UP; PAX1-UP)
- Mini Hydraulic Excavator:
- 302.5C (S/N: GBB1-UP)
- Mobile Hydraulic Power Unit:
- 374D MHPU (S/N: JNZ1-UP)
- Work Tool:
- HYDRAULIC KIT (S/N: HKD1-UP)
Introduction
This Special Instruction covers the installation procedure for 390-1561 Front Lines Group on the models and applications listed above.
Safety Section
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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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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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| Illustration 1 | g00104545 |
Prevent the machine from movement. Park the machine on a level surface.
Attach a "Do Not Operate" warning tag or a similar warning tag to the start switch or to the controls before you service the equipment. These warning tags (Special Instruction, SEHS7332) are available from your Caterpillar dealer.
Required Parts
| Parts list for 390-1561 Front Lines Gp - 01 | |||
|---|---|---|---|
| Item | Qty | Part Number | Description |
| (1) | 4 | 124-0909 | Clip |
| (2) | 1 | 160-0964 | Manual Valve Gp |
| (3) | 4 | 170-8553 | Bolt |
| (4) | 1 | 175-1814 | Manual Valve Gp |
| (5) | 1 | 232-4144 | Relief Valve Gp |
| (6) | 2 | 236-3067 | Block |
| (7) | 1 | 236-3081 | Support |
| (8) | 1 | 245-5250 | Block |
| (9) | 1 | 266-0989 | Support |
| (10) | 1 | 266-0990 | Support As |
| (11) | 1 | 296-7210 | Block |
| (12) | 1 | 296-7211 | Tube As |
| (13) | 1 | 325-8841 | Block |
| (14) | 1 | 338-6047 | Tube As |
| (15) | 1 | 338-6048 | Tube As |
| (16) | 1 | 347-2076 | Hose As |
| (17) | 1 | 347-2077 | Pipe As |
| (18) | 2 | 352-6914 | Relief Valve Gp |
| (19) | 1 | 356-9091 | Support As |
| (20) | 1 | 356-9103 | Support As |
| (21) | 1 | 390-1562 | Hose As |
| (22) | 2 | 101-7402 | Bolt |
| (23) | 4 | 105-3485 | Bolt |
| (24) | 1 | 148-8404 | Plate |
| (25) | 2 | 164-4180 | Plug As |
| (26) | 2 | 1P-3704 | Rectangular Seal |
| (27) | 8 | 1P-3705 | Rectangular Seal |
| (28) | 4 | 1P-4579 | Half Flange |
| (29) | 4 | 1P-5767 | Half Flange |
| (30) | 2 | 4J-0522 | O-Ring Seal |
| (31) | 3 | 4J-0524 | O-Ring Seal |
| (32) | 1 | 4J-0526 | O-Ring Seal |
| (33) | 1 | 5P-1076 | Hard Washer |
| (34) | 4 | 7X-2549 | Bolt |
| (35) | 12 | 7X-2550 | Bolt |
| (36) | 8 | 8T-4139 | Bolt |
| (37) | 4 | 447-1707 | Bolt |
| (38) | 4 | 8T-4176 | Bolt |
| (39) | 9 | 8T-4183 | Bolt |
| (40) | 5 | 8T-4192 | Bolt |
| (41) | 4 | 8T-4191 | Bolt |
| (42) | 35 | 8T-4223 | Hard Washer |
| (43) | 2 | 8T-4648 | Bolt |
| (44) | 16 | 8T-4956 | Bolt |
| (45) | 4 | 451-2175 | Washer |
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| Illustration 2 | g03422813 |
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| Illustration 3 | g03422862 |
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| Illustration 4 | g03422886 |
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| Illustration 5 | g03422887 |
Standard Removal
The following parts will be removed during the installation of the 390-1561 Front Lines Gp .
| Standard Removal | |||
| Item | Qty | Part Number | Description |
| (-) | 2 | 4I-7822 | Cover |
| (-) | 2 | 1P-3705 | Rectangular Seal |
| (-) | 8 | 8T-4139 | Bolt |
| (-) | 1 | 266-1001 | Support As |
| (-) | 1 | 239-2009 | Support As |
| (-) | 1 | 245-5222 | Cover |
| (-) | 1 | 4J-0524 | O-Ring Seal |
| (-) | 4 | 8T-4139 | Bolt |
| (-) | 2 | 6E-3993 | Plug As |
Installation Procedure
| NOTICE |
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Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life. |
| 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. |
Note: Put identification marks on all hoses, hose assemblies, harness assemblies, and on all tube assemblies for installation purposes. Plug all hose assemblies and all tube assemblies.
- Install brackets as shown.
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| Illustration 6 | g03425450 |
- Install blocks and valve assemblies.
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| Illustration 7 | g03425468 |
- Install pipe assemblies and relief valve (18) .
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| Illustration 8 | g03425524 |
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| Illustration 9 | g03425598 |
- Install hose (21) .
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| Illustration 10 | g03425624 |
- Install hose (16) .
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| Illustration 11 | g03425677 |
- Check all connections for leaks.
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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, causing serious injury, and possible death. Always use a board or cardboard when checking for a leak. Do not check for pin hole leaks in pump or motor hoses during a steer stall condition. If fluid is injected into your skin, it must be treated by a doctor familiar with this type of injury immediately. |
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