Removal and Installation of Fuel Cooler

r. Cap assembly (2-6) attachment

Attach the spring seat (2-3), then the springs (2-4) to the spool assembly (22).

After checking that the O-ring (2-6-5) is mounted to the cap assembly (2-6) and that the O-rings(2-10) is mounted to the base plate (2-1), mount the spring seats (2-5) on the cap assembly (2-6), then attach the cap assembly (2-6) to the base plate (2-1).

Finally, tighten the hexagon socket head bolts (2-6-6) to the specified torque.

Caution: •Apply grease to the O-ring (2-6-5). •The cap assembly (2-6) is pressed up by the springs (2-4). When tightening the socket head bolts (2-6-6), push the cap assembly (2-6) down by hand. •When tightening the hexagon socket head bolts (2-6-6), evenly tighten the 4 bolts. If the cap assembly (2-6) is tightened at a slant, this could cause damage to O-ring (2-6-5) and cause oil leaking.

(3) Quality check after assembly [1] Air leak test Seal all the ports except one motor line port with plugs, then apply compressed air (0.03 MPa) from the open port for 2 min. with the part submerged in water and check that there are no air bubbles. [2] After the air leak test, fill the motor case with hydraulic oil, then supply hydraulic oil at 20 L/min and turn counter-clockwise and clockwise for 2 min. each to warm up. During this operation, check that there is no abnormal heating, vibration or noise.