2001/06/26 Service Brake System Pressure - Test (SENR1223-01)
SMCS - 4250 i01562130
PPW
2 - 80moves
Personal injury can result if0 25/ 024while
the machine testing.
0 move
If the machine begins to2
07test,
/ Ethe8D
:1 during 1 1
reduce engine
SEN 2the
speed immediately and engage :3parking
7-0 brake.
© 2 R122 5:00
025 3
Cat
erp of oil under
Sudden movement of the machine or release
illathe machine.
pressure can cause injury to persons on or near
r In
c.
To prevent possible injury, perform the procedure that follows
before testing and adjusting the brake system.
Table 1
REQUIRED TOOLS
Part Number Description Quantity
8T-0859 Pressure Gauge 0 to 25000 kPa 1
177-7860 Hose Assembly 1
6V-4143 Couplers 2
6V-3989 Test Fitting 1
8T-8902 Tee 1
6V-3965 Test Fitting 1
3J-1907 O-Ring Seal 1
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1. Stop the engine. Move the transmission control lever into the neutral
position. Engage the parking brake.
PPW
2. Remove the hydraulic oil pressure from the brake system by pushing
2 0 -80
on the brake pedal until there is no brake pressure.
3. Remove the cap from the test2
5 024brakes on the rear
port for the service
axle. Install a 6V-41430
2 / 07end E8DHose
Coupler to each
Assembly. Install a 6V-3989:1
2 /
Fitting (Test) to
of a 177-7860
1the
1 8T-0859 Pressure
SENgauge:3and7test
Gauge. Install the pressure
- fitting to one end of the
R
hose assembly. Install the other end of the 0hose
5 : assembly to the test
port. © 2 122 0 0
3
02 Before you start the engine, the hydraulic
4. Look at the pressure gauge. 5
C
oil pressure must be 0 kPa (0 psi). at
erp
illnormal
5. Start the engine. Allow the hydraulic oil to reach ar I operating
pressure and normal operating temperature. nc.
6. Depress the brake pedal. Do not permit the brake pedal to come up.
Look at the pressure gauge. The pressure must be 6900 ± 350 kPa
(1000 ± 50 psi).
7. If the brake pressure is not within the specified range, but the
accumulator charging valve was in the specified range, replace the
brake control valve.
8. Install the 3J-1907 O-Ring Seal on the 6V-3965 Test Fitting. Install the
test fitting to the 8T-8902 Test Tee. Install the test tee in the brake line
to the front axle if a test tee is not in the line. Repeat the procedure on
the line for the front service brake.
Note: The hydraulic oil pressure for the upper brake port should be
approximately 350 kPa (50 psi) higher than the hydraulic oil pressure for
the lower brake port.
PPW-80024E8D
2025/07/11
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02:12:11-05:00
i01562130
© 2025 Caterpillar Inc.
PPW
202 -8002
5/0 4
7/1 E8D
1
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