525C Wheel Skidder, 535C Wheel Skidder and 545C Wheel Skidder Power Train Caterpillar


Transmission Hydraulic System

Usage:

525C 525



Illustration 1g01283494

(1) Transmission oil pump

(2) Oil filter

(3) Torque converter

(4) Torque converter lockup clutch

(5) Modulating valve

(6) Torque converter outlet

(7) Oil cooler

(8) Transmission lubrication

(9) Modulating valve for second gear

(10) Modulating valve for forward high

(11) Modulating valve for first gear

(12) Modulating valve for forward low

(13) Modulating valve for third gear

(14) Modulating valve for reverse

(15) Transmission hydraulic control relief valve

(16) Torque converter inlet relief valve

(17) Sump

(18) Suction screen and magnet

(A) Clutch 2 for forward high gear

(B) Clutch 1 for forward low gear

(C) Clutch 3 for reverse gear

(D) Clutch 4 for second gear

(E) Clutch 6 for first gear

(F) Clutch 5 for third gear

When the engine is started,transmission oil pump (1) pulls oil from sump (17). Transmission oil pump (1) sends pump oil through transmission oil filter (2). Pressurized transmission oil flows from the transmission oil filter to the oil inlet in the transmission housing. The pressurized oil flows through an internal passage of the transmission housing. The oil then flows to the transmission control valve in order to supply transmission main relief valve (15) with oil. The transmission main relief valve maintains a constant pressure to the modulating valves.

The oil in the clutches that are not engaged is sent back to sump (17) and the oil becomes return oil.

The transmission relief valve (15) controls the pressure of the pump oil that is supplied to the modulating valves. The transmission relief valve (15) directs the unneeded pump oil to torque converter (3) as torque converter oil. Torque converter outlet oil flows through torque converter outlet (6) to oil cooler (7) as lubrication oil. After the oil cools, the oil flows through the lubrication system and to sump (17).

Caterpillar Information System:

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