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| Illustration 1 | g01490996 |
Schematic for the power train hydraulic system (1) Transmission lubrication pressure "L1" (2) Accumulator (3) Main relief pressure "P" (4) Main relief valve (5) Passage for the lubrication of the transmission and the bevel gear (6) Planetary gears and brake (7) Lubrication pressure for the left brake "LB1" (8) Brake pressure for the left brake (9) Brake pressure "B1" (10) Electronic brake control valve (11) Lubrication manifold (12) Torque converter inlet relief valve (13) Torque converter inlet pressure "M" (14) Torque converter outlet pressure "N" (15) Torque converter outlet relief valve (16) Screen (17) Hydraulic pump (18) Lubrication pressure for the flywheel "L2" (19) Acert C9 Engine (20) Power train oil cooler (21) Torque converter (22) Vent line (23) Magnetic screen (24) Torque converter and lubrication section (A) (25) Transmission and controls section (B) (26) Transmission and torque converter scavenge section (C) (27) Scheduled oil sampling port (S·O·S port) (28) Transmission oil filter and bypass valve (29) Passages for lubrication of the steering differential (30) Lubrication pressure for the right brake "Lb2" (31) Brake pressure for the right brake (32) Planetary gears and brake (33) Screen (34) Transmission and transmission modulating valves | |
Note: If equipped, brake pressure tap "B1" can be located on the top of the back cover of the transmission at the rear of the machine.
The power train hydraulic system uses a three-section pump. The oil pump is mounted on the gear case for the bevel and transfer gears. The pump is driven by an auxiliary drive shaft from the engine.
Torque Converter Charge Pump Section
Section (A) sends oil from the bevel gear case. The oil goes through a magnetic screen (23). Next, the oil flows to torque converter inlet relief valve (12). Torque converter inlet relief valve (12) is located in lubrication manifold (11). Torque converter inlet relief valve (12) limits the maximum oil pressure to torque converter (21). The inlet relief valve sends most of the oil to torque converter (21). The rest of the oil is sent to the lubrication manifold. The oil is used to lubricate the brakes and the transmission.
The oil from torque converter (21) exits through outlet relief valve (15). Next, the oil is routed to oil cooler (20). Then, the oil flows back to lubrication manifold (11). At the lubrication manifold, the oil combines with the oil that bypassed torque converter (21) .
The combined oil flows from lubrication manifold (11) in order to lubricate the transmission and brakes. Then, the oil drains to the bevel gear case. A small portion of the oil is diverted from the torque converter inlet in order to lubricate the drive gears and bearings.
Transmission Charge Pump Section
Section (B) of the pump draws oil from the bevel gear case. The oil goes through a magnetic screen (23). Then, oil flows to oil filter (28). Next, the oil flows to brake control valve (10), the modulating valves (34) and main relief valve (4). The main relief valve is located in the manifold on the top of the transmission. The main relief valve controls the pressure in the circuit.
The oil that flows past the main relief valve provides part of the lubrication and cooling for the transmission and bevel gear (5). The primary use of oil from section (B) is for control of the brakes and of the transmission clutches.
Torque Converter and Transmission Scavenge Section
Section (C) removes oil from torque converter (21) and from the transmission (34). The oil goes through screen (16) or screen (33). The oil is used as lubrication for the steering differential and brake (29). The oil is then allowed to flow back into the bevel gear case.