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| Illustration 1 | g03661853 |
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824K - 825K (1) Pump (two-section) (2) Transmission Filter (3) Modulating Valve (Torque Converter) (Lock Up) (4) Modulating Valve (Reverse) (Clutch 1) (5) Modulating Valve (Forward) (Clutch 2) (6) Modulating Valve (Fourth Speed) (Clutch 3) (7) Modulating Valve (Third Speed) (Clutch 4) (8) Modulating Valve (Second Speed) (Clutch 5) (9) Modulating Valve (First Speed) (Clutch 6) (10) Main Relief Solenoid Valve (11) Torque Converter Inlet Relief (12) Torque Converter Outlet Valve (13) Transmission Cooler (14) Sump (15) Suction Screen (16) Torque Converter (inlet) (17) Transmission Lubrication (18) Clutch 6 lubrication (19) Pump drive lubrication | |
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| Illustration 2 | g03661995 |
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826K Transmission schematic. The 826K Machine does NOT have a third gear (clutch 4) (1) Pump (two-section) (2) Transmission Filter (3) Modulating Valve (Torque Converter) (Lock Up) (4) Modulating Valve (Reverse) (Clutch 1) (5) Modulating Valve (Forward) (Clutch 2) (6) Modulating Valve (Fourth Speed) (Clutch 3) (8) Modulating Valve (Second Speed) (Clutch 5) (9) Modulating Valve (First Speed) (Clutch 6) (10) Main Relief Solenoid Valve (11) Torque Converter Inlet Relief (12) Torque Converter Outlet Valve (13) Transmission Cooler (14) Sump (15) Suction Screen (16) Torque Converter (inlet) (17) Transmission Lubrication (18) Clutch 6 lubrication (19) Pump drive lubrication | |
The transmission hydraulic system consists of the following components:
- suction screen (15) and magnet
- transmission oil pump (1)
- transmission oil filter (2)
- transmission hydraulic control relief valve (10)
- clutch solenoid modulating valves
- torque converter (16)
- torque converter inlet relief valve (11)
- oil cooler (13)
The bottom of the output transfer gear case contains the oil sump from which the transmission oil pump pulls oil from. Transmission oil pump is a two-section positive displacement gear pump. The transmission oil pump has one inlet and two outlet ports. The two outlet ports are the charging outlet and the lube outlet. As the pump rotates, oil from the charge outlet oil flows to the transmission oil filter. Oil from the transmission oil filter then flows to the clutch solenoid modulating valves. Oil from the lube outlet of the oil pump flows to the torque converter, torque converter inlet relief valve (11), and relief solenoid valve (10).
Clutch solenoid modulating valves are mounted on the top of the transmission. There is one clutch solenoid modulating valve for each of the six transmission clutches. In order to move the machine, a direction clutch solenoid and a speed clutch solenoid must be energized. Clutch solenoid modulating valves are used to directly modulate the oil pressure that is sent to each individual clutch. The clutch oil leakage and the return oil flows to the bottom of the transmission to the sump. All oil from non-energized clutch solenoid modulating valves flows to the bottom of the transmission to the sump. The oil sump is the bottom of the output transfer gear case.
Transmission hydraulic control relief valve controls the pressure of the oil that is supplied to clutch solenoid modulating valves. Oil flows into transmission hydraulic control relief valve (10) at a maximum pressure of
The oil from torque converter flows to relief valve. Relief valve maintains the oil pressure that is inside torque converter at a minimum of
Transmission oil cooler is located under the engine, attached to the fuel tank. After the oil has been cooled, the oil flows to the transmission. The oil provides lubrication to the transmission and cooling to the transmission. The oil flows through internal passages in the transmission to the bearings, the gears, and the clutches. The oil then flows to the bottom of the transmission. The oil then flows to oil sump in the bottom of the output transfer gear case.