992K Wheel Loader and 854K Wheel Dozer Power Train Caterpillar


Transmission Hydraulic Control

Usage:

992K 880


Illustration 1g01449219
Transmission hydraulic control (side view)
(1) Solenoids
(2) Control solenoid manifold
(3) Top manifold
(4) Selector and pressure control valve
(5) Plate
(6) Selector valve body
(7) Cover

The transmission hydraulic control controls the oil pressure to the torque converter, to the transmission clutches, and to the lubrication circuits. The transmission hydraulic control also controls the flow of oil to the clutches. The transmission hydraulic control is installed on the top of the transmission planetary group. The control consists of the following components: solenoids (1), manifold (2), top manifold (3), selector and pressure control valve (4), plate (5) and selector valve body (6). The speed selector spool for second speed is behind cover (7).



Illustration 2g01449241
Transmission hydraulic control (top view)
(8) Number 3 clutch solenoid.
(9) Number 4 clutch solenoid.
(10) Number 5 clutch solenoid.
(11) P1 pressure tap
(12) P3 pressure tap
(13) Oil tube for inlet from pump
(14) P2 pressure tap
(15) Oil tube for outlet to torque converter
(16) Number 2 clutch solenoid
(17) Number 1 clutch solenoid
(18) Plug for load piston

Inlet oil for the operation of the hydraulic control flows from the transmission oil filters. This oil flows through tube (13) to the selector and pressure control valve.

Oil for the operation of the torque converter flows through tube (15) and through an oil line to the torque converter.

The clutch solenoids direct pump oil to the ends of the selector spools. The selector spools move in order to send oil to the clutch causing the clutch to engage.



Illustration 3g01449253
Transmission hydraulic control (bottom view)
(6) Selector valve body
(19) Passage to number 4 clutch
(20) Passage to number 2 clutch
(21) Passage to number 1 clutch
(22) Passage to number 3 clutch
(23) Passage to number 5 clutch

Oil to the clutches is sent through openings (19), (20), (21), (22), and (23) in the selector valve body. The selector valve body is attached to the top of the planetary group.

Caterpillar Information System:

950K and 962K Wheel Loaders Electrohydraulic System MID 082 - CID 2183 - FMI 13
854K Wheel Dozer Electrohydraulic System MID 082 - CID 2475 - FMI 04
854K Wheel Dozer Electrohydraulic System MID 082 - CID 2475 - FMI 08
854K Wheel Dozer Electrohydraulic System MID 082 - CID 2475 - FMI 03
854K Wheel Dozer Electrohydraulic System MID 082 - CID 1047 - FMI 06
992K Wheel Loader Electrohydraulic System MID 082 - CID 2671 - FMI 06
992K Wheel Loader Electrohydraulic System MID 082 - CID 2671 - FMI 05
854K Wheel Dozer Electrohydraulic System MID 082 - CID 1197 - FMI 03
854K Wheel Dozer Electrohydraulic System MID 082 - CID 1047 - FMI 05
854K Wheel Dozer Electrohydraulic System MID 082 - CID 2477 - FMI 13
854K Wheel Dozer Electrohydraulic System MID 082 - CID 2477 - FMI 08
854K Wheel Dozer Electrohydraulic System MID 082 - CID 2477 - FMI 04
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992K Wheel Loader and 854K Wheel Dozer Power Train Transmission Hydraulic Control Operation
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