- Track-Type Tractor:
- D6R (PIN: 1RW1-UP; 2HM1-UP; 2YN1-UP; 3ZN1-UP; 4FM1-UP; 4HN1-UP; 4JR1-UP; 4MN1-UP; 4TR1-UP; 4WR1-UP; 5LN1-UP; 5PR1-UP; 5RR1-UP; 6FR1-UP; 6GR1-UP; 6HR1-UP; 6JN1-UP; 6MR1-UP; 7AR1-UP; 7DR1-UP; 7GR1-UP; 7KN1-UP; 8LN1-UP; 8TM1-UP; 8XN1-UP; 9BM1-UP; 9MN1-UP; 9PN1-UP; 9ZS1-UP)
Description of Change: The location of the relief valve on the hydraulic tank has been changed. The new location is on the top of the hydraulic tank. See Illustration 1. The former location was horizontal in the access cover of the tank. See Illustration 2. In the horizontal position, oil in the hydraulic tank could leak out of the relief valve. The vertical position of the relief valve in the top of the tank will prevent the relief valve from leaking oil.
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| Illustration 1 | g00692876 |
New Relief Valve Location in the Hydraulic Tank | |
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| Illustration 2 | g00692872 |
Former Relief Valve Location in the Hydraulic Tank | |
Adaptable To: The change to the relief valve location can be adapted to earlier machines. The 108-1532 Hydraulic Tank and Filter Gp can be updated by reworking the 108-1656 Tank. A 9U-7003 Weld Boss must be welded on the top of the tank that will allow the installation of the 3G-4783 Breaker Relief Valve. See Illustration 4. A 9S-8008 O-Ring Plug and a 3D-2824 O-Ring Seal must be installed in the former Breaker Relief Valve port in the access cover.
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| Illustration 3 | g00692881 |
(1) Test Port (A) 271 mm (10.70 inch) (B) 50 mm (2.00 inch) | |
The 108-1656 Tank can be reworked by performing the following steps:
- Cut a hole in the top of the tank that is 25 mm (0.99 inch) in diameter. See Illustration 3.
- Locate the 9U-7003 Weld Boss over the hole on the top of the tank.
- Clamp the weld boss on the top of the tank.
- Weld the boss onto the tank with a 3 mm (0.12 inch) fillet weld.
Reference: Service Magazine, SEPD0025, 2 July 1990, "Welding On Fuel and Hydraulic Tanks".
- Clean the welded area thoroughly and clean the inside of the tank thoroughly.
- Pressure test the tank through port (1) with a pressure of 105 ± 35 kPa (15 ± 5 psi).