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MAT 0878475 - Caterpillar

0878475 MAT Caterpillar parts MAT
Alternative (cross code) number:
Caterpillar 0878475 MAT

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Illustration 1 g03718014
Cooling Fan Hydraulic System (1) Oil cooler (2) Cooler bypass check valve (3) Oil cooler bypass manifold (4) Port "J" (5) Port "A" (6) Port "B" (7) Port "E" (8) Port "F" (9) To manual brake valve (10) Port "D" (11) Fan pump (12) Servo piston (13) Fan solenoid (14) Pressure compensator spool (15) Fan motors (16) From auxiliary pump case drain (17) From tamper pump case drain (18) Case manifold (19) From front wheel assist pump case drain (20) From front wheel assist valve (21) From tow point/hopper valves (22) Return manifold (23) From charge filter bypass (24) From steering valve (25) From auxiliary valve (26) Tamper return (27) Bypass valve (28) From tamper/vibratory motor case drains (29) From ventilation motor return (30) Hydraulic tank (31) Return filter (32) To port "S" left propel pump (33) Combined suction and return filter (34) To port "S" right propel pump (35) Makeup valve (36) Bypass valve (37) To charge and generator pump (38) To front wheel assist pump (39) To tamper pump (40) To tamper pump (41) Suction strainers (42) SOS tap (43) Combination pressure switch (44) Return pressure switch (45) Anticavitation check valvesWhen the engine is operating, fan pump (11) generates flow. Supply oil from the fan pump flows to the following locations:
Pressure compensator spool (14)
Fan solenoid (13)
Port "MB" of fan pump (11)
Fan motors (15) Inside fan motors (15), supply oil closes anticavitation check valves (45) .When the engine is stopped, the inertia of the fan blades causes fan motors (15) to continue to turn for a brief period. Since the engine is not operating during this time, fan pump (11) does not provide flow to prevent motor cavitation. In this case, anticavitation check valves (45) open. The anticavitation check valves prevent motor cavitation by allowing the fan motors to draw oil from the return line.Oil cooler bypass manifold (3) receives return oil from various hydraulic

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