990K Wheel Loader Machine Systems Caterpillar


Pressure Tap Locations

Usage:

990K A9P

Implement Service Ports



Illustration 1g03677559
Pressure taps located under the center platform door behind the cab. View from left-hand side of machine.
(T1) Implement pump forward discharge pressure
(T2) Implement pump rear discharge pressure
(T4) Implement rear case drain pressure
(T5) Implement pump and valve pilot pressure
(T6) Fan pump discharge pressure
(T11) Steering discharge pressure
(T12) Steering pump load sense pressure
(T14) Steering pump case drain pressure
(T20) Service brake pump case drain pressure


Illustration 2g03677906
Pressure taps located under the center platform door behind the cab. View from behind cab.
(T1) Implement pump forward discharge pressure
(T2) Implement pump rear discharge pressure
(T3) Implement pump forward case drain pressure
(T4) Implement pump rear case drain pressure
(T5) Implement pump and valve pilot pressure
(T6) Fan pump discharge pressure
(T7) Fan pump case drain pressure
(T11) Steering pump discharge pressure
(T12) Steering pump load sense pressure
(T13) Steering primary pilot pressure
(T14) Steering pump case drain pressure

Steering Service Ports



Illustration 3g03677558
Pressure taps located under the center platform door behind the cab. View from right -hand side of machine.
(T5) Implement pump and valve pilot pressure
(T6) Fan pump discharge pressure
(T7) Fan pump case drain pressure
(T11) Steering pump discharge pressure
(T13) Steering pilot pressure
(T14) Steering pump case drain pressure
(T20) Service brake pump case drain pressure

Service Brake Ports



Illustration 4g03679100
The service brake pressure taps are located under the cab, on the engine end frame. The taps are to the right of the upper articulated hitch.
(T16) Front service brake pressure tap
(T17) Rear service brake pressure tap


Illustration 5g03679109
The brake accumulator pressure taps are located below the brake accumulators. The accumulators are secured to a plate in front of the implement oil tank. The tank is under the platform, on the right-hand side of the machine.
(T18) Front service brake accumulator pressure tap
(T19) Rear service brake accumulator pressure tap


Illustration 6g03677559
Pressure taps located under the center platform door behind the cab. View from left-hand side of machine.
(T1) Implement pump forward discharge pressure
(T2) Implement pump rear discharge pressure
(T4) Implement rear case drain pressure
(T5) Implement pump and valve pilot pressure
(T6) Fan pump discharge pressure
(T11) Steering discharge pressure
(T12) Steering pump load sense pressure
(T14) Steering pump case drain pressure
(T20) Service brake pump case drain pressure

Power Train Service Ports

Transmission Service Ports



Illustration 7g03679283
Pressure taps located under the center platform door behind the cab. View from rear of machine.
(T25) P1 (speed clutch) pressure tap
(T26) P2 (directional clutch) pressure port
(T27) Pressure port (under the cover on the hydraulic control valve)
(T28) Transmission supply port
(T29) Torque converter pressure port

Torque Converter, Lock Up Clutch, Impeller Clutch



Illustration 8g03677972
Remote pressure taps for the lockup clutch and the impeller clutch are located next to the steering primary pilot pressure tap. These taps are under the platform center access panel, behind the cab.
(T13) Steering primary pilot pressure tap
(T21) Lockup clutch pressure tap
(T22) Impeller clutch pressure tap

Transmission Pump and SOS Service Ports



Illustration 9g03679256
The power train pump oil pressure tap and the transmission SOS tap are located under the platform on the left-hand side of the machine. An access door in the platform is located behind the cab.
(T23) Power train pump oil pressure tap
(T24) Transmission SOS tap

SOS Ports



Illustration 10g03677557
Steering S.O.S sampling tap (T9) is located behind the left, rear tire on the inside of the frame rail. The pressure tap is part of the hydraulic oil cooler return line.
(T9) Steering SOS tap


Illustration 11g03679940
Implement and Fan S.O.S sampling tap (T15) is located behind the right, rear tire on the inside of the frame rail. The pressure tap is part of the hydraulic oil cooler return line.
(T15) Implement and Fan SOS tap


Illustration 12g03679256
The power train pump oil pressure tap and the transmission SOS tap are located under the platform on the left-hand side of the machine. An access door in the platform is located behind the cab.
(T23) Power train pump oil pressure tap
(T24) Transmission SOS tap

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