CONFIDENTIAL TIBU4271-00

Oil leaks may occur from the hoses that join the hydraulic oil cooler and the return and filter lines at the hydraulic oil cooler.

If the hoses that join the hydraulic oil cooler and the return and filter lines leak, replace the hoses. Use the procedure that follows for replacement of the hoses.

The length of the new hoses is increased. A new support correctly positions the oil cooler pipe after the installation of the longer hoses. Additional hose clamps are also added to the new hose in order to prevent oil leaks. The effectivity of the improved hoses is listed in Table 1.

Table 1.

Refer to the Service Manual that is appropriate for your machine.

Table 2.
¹All 330C Excavators Except 330C L (DKY) Excavators

1. Procure the required parts that are listed in Table 2.



Illustration 1. Return And Filter Lines Group
(1) 144-0367 Hose Clamp
(2) 8T-4192 Bolt
(3) 8T-4223 Hard Washer
(4) 221-4893 Hose
(5) 212-5458 Support
(6) 7Y-5247 U-Bolt
(7) 8T-4121 Hard Washer
(8) 096-4883 Locknut

2. Loosen the two hose clamps (1) on the former hose (4) at the INLET side of the oil cooler. Remove the former hose. Discard the hose and retain the hose clamps. Refer to Illustration 1.

NOTE: 330C L (DKY) Excavators are configured with a 221-4872 Hose at the INLET side of the oil cooler.

3. Loosen the two hose clamps (1) on the former hose (4) at the OUTLET side of the oil cooler. Remove the former hose. Discard the hose and retain the hose clamps.
4. Loosen and remove the two bolts (2) and hard washers (3), the U-bolt (6), two locknuts (8), and two hard washers (7) from the former support (5). Discard the former support. Retain the two bolts, U-bolt, two locknuts, and four hard washers.



Illustration 2. Return And Filter Lines Group
(1) 144-0367 Hose Clamp (typical in four places)
(2) 8T-4192 Bolt
(3) 8T-4223 Hard Washer
(6) 7Y-5247 U-Bolt
(7) 8T-4121 Hard Washer
(8) 096-4883 Locknut
(9) 227-0428 Hose
(10) 227-0471 Support

5. Install a new hose (9) on the INLET side of the hydraulic oil cooler. Use the two hose clamps (1) retained in Step 2 and two new hose clamps (1). Tighten the four hose clamps to a torque of 7.5 ? 0.5 N?m (5.5 ? 0.4 lb ft). Refer to Illustration 2.
6. Install a new hose (9) on the OUTLET side of the hydraulic oil cooler. Use the two hose clamps (1) retained in Step 3 and two new hose clamps. Tighten the four hose clamps to a torque of 7.5 ? 0.5 N?m (5.5 ? 0.4 lb ft).
7. Install new support (10). Use the two bolts (2), two hard washers (3), U-bolt (6), two locknuts (8), and hard washers (7) retained in Step 4. Tighten to a torque of 22 ? 3 N?m (16 ? 2 lb ft).
8. Check the new hoses in order to make sure that the leaks are eliminated.

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