PISTON-LOAD 8E9895 - Caterpillar

Implement Hydraulic Oil Tank
Illustration 1 g03878689
Component identification
(1) Fan return filter (from cooler)
(2) Case drain filter (pilot pump, right implement pump)
(3) Case drain filter (fan pump, left implement pump)
(4) Port - (pressure equalizing line to/from steering tank)
(5) Return port - case drain (pilot pump, right implement pump)
(6) Return port - case drain (fan pump, left implement pump)(
(7) Return port - from cooler
(8) In-tank screen (axle oil cooler pump and fan motor, pilot oil return)
(9) Supply port - axle oil cooler fan pump, implement cooler pump, pilot pump
(10) Supply port - left implement pump
(11) Supply port - right implement pump
(12) Return port - Implement return
(13) In-tank screens (implement return ) Oil flowing to the hydraulic oil tank from the cooler enters through return port (7). Cooled oil will then flow through three filter elements within fan return filter (1).Case drain oil flowing from the pilot pump and right implement pump enters return port (5). Oil that enters return port (5) flows through three filter elements that are within case drain filter (2).Case drain oil flowing from the fan pump and left implement pump enters return port (6). Oil that enters return port (6) flows through three filter elements that are within case drain filter (3).In-tank screen (8) filters the oil returning to the tank from the following components: axle oil cooler pumps, axle oil cooler fan motor and pilot oil return from the implement control valves and pilot pressure reducing valve.Implement return oil from both implement control valves enters the tank through return port (12). Oil then flows through four in-tank screens (13).Port (4) is a connection point for a line to the steering hydraulic oil tank. This line with equalize the pressure between the two tanks.Implement Pump Screens
Illustration 2 g03878960
Left front view
(1) Right implement pump
(2) Left implement pump
(3) Pilot supply screens
(4) Implement supply screens Implement supply screens (4) for the implement pumps filter any debris that is in the hydraulic oil. The screens prevent debris from implement pumps (1) and (2) from contaminating the oil to prevent damage to downstream components.Each implement supply screen (4) contains a pressure switch to monitor when a screen becomes restricted.Correct maintenance recommendations must be followed in order to ensure that the screen assembly does not become plugged with debris.Pilot supply screens (3) filter out any debris in the pilot oil that enters the implement pump for pump control.Pilot Filter
Illustration 3 g03878492
View of service area behind the cab
(1) Pilot oil filter
Illustration 4 g03878588
Pilot oil filter (1)
( 2) Filter bypass switch
(3) Oil inlet passage
(4) Test port
(5) Filter base
(6) Oil outlet passage
(7) Filter element
(8) Filter housing The pilot filter filters any debris that is in the hydraulic oil. The filter prevents debris from the pilot pump from contaminating the oil that is in the hydraulic oil tank.Correct maintenance recommendations must be followed in order to ensure that the filter element does not become plugged with debris. If filter element (7) is plugged, the flow of filtered oil to the system stops. However, unfiltered oil will flow through the bypass valve.Prior