ENGINE AR 3878601 - Caterpillar

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Disconnect harness assembly (2).
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Disconnect hose assemblies (3).
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Loosen clamp (5) and remove hose (4).
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loosen nut (9) and remove bolt (6). Position strap (8) aside. Repeat for the remaining strap.
Remove diesel exhaust fluid tank (7).
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Illustration 7 g03505556Note: Mark the sending unit and the diesel exhaust fluid tank for reinstallation.
Remove bolts (10) and remove sending unit (11). Remove gasket (12).
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Illustration 9 g03505565Note: Mark the sending unit and the diesel exhaust fluid tank for reinstallation.
Remove bolts (13) and remove level sensor (14). Remove gasket (15).
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Remove plug (16). Remove O-ring seal (17).
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Remove adapter (18). Remove O-ring seal (19).
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Remove plugs (20) and (21). Remove O-ring seals (22) and (23). Installation Procedure
Install diesel exhaust fluid tank (7) in the reverse order of removal.
Tighten plugs (16) and (21) to a torque of 11 3 N m (97 27 lb in).
Tighten plugs (20) to a torque of 28 5 N m (21 4 lb ft).
Tighten adapter (18) to a torque of 40 6 N m (30 4 lb ft).
Tighten bolts (10) in an X pattern to a torque of 5 1 N m (44 9 lb in).