318B Pump
318B Pump
318B Pump
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Producto: EXCAVATOR
Modelo: 318B EXCAVATOR 3LR00473
Configuración: 318B L & 318B LN Excavators 3LR00001-UP (MACHINE) POWERED BY 3046 Engine
Pruebas y Ajustes
318B Excavator Hydraulic System
Número de medio -RENR3281-02 Fecha de publicación -01/11/2004 Fecha de actualización -02/11/2004
i01245585
Illustration 1 g00304069
Electronic controller
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Illustration 2 g00304070
Right console
Note: Before starting main pump flow tests, check operator monitor panel (4) and alarm lamp (1) on
electronic controller (2) for normal operation. If no faults are present, perform the operational checks.
Refer to Testing And Adjusting, "Operational Checks".
Note: If the operational checks (cycle time) indicate that slow speed of an implement is common to
the circuits of one pump, the problem is most likely in the hydraulic system. Then perform the pump
flow tests. Refer to Testing And Adjusting, "Piston Pump (Main) - Test".
Note: The engine, the fuel, or the working altitude may be the problem if the operational checks
indicate that slow speed of an implement is common to both pump circuits.
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Illustration 3 g00389975
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Illustration 4 g00390092
Circuit diagram
(2) Connector
(3) Tee
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(19) Engine
(20) Multitach
Illustration 5 g00451803
Swing motor
(2) Connector
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Illustration 6 g00444610
(20) Multitach
(22) Valve
Illustration 7 g00451804
Pump compartment
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Preparation
NOTI CE
Front Pump
3. Release the pressure in the hydraulic system. Refer to Testing And Adjusting, "Hydraulic
System Pressure - Release".
4. Install the following tools in accordance with the flow meter tool layout and the circuit diagram.
Refer to Illustration 3 and Illustration 4.
c. Disconnect makeup line (4) from connector (2) at swing motor (1) .
f. Connect portable hydraulic tester (8) between front pump (16) and tee (3) .
g. Connect 6000 kPa (870 psi) pressure gauge (10) to pressure tap (15). This is used to
measure power shift pressure.
h. Connect 60000 kPa (8700 psi) pressure gauge (12) to pressure tap (14). This is used to
measure front pump delivery pressure.
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i. Install multitach group (20) on engine (19). This is used to monitor engine speed.
j. Disconnect negative flow control line (17) from front pump (16). Install seal (36) and
plug (18) to the end of negative flow control line (17) .
Rear Pump
Illustration 8 g00451806
Pump compartment
3. Release the pressure in the hydraulic system. Refer to Testing And Adjusting, "Hydraulic
System Pressure - Release".
4. Install the following tools in accordance with the flow meter tool layout and the circuit diagram.
Refer to Illustration 3 and Illustration 4.
b. Install plug (7) and seal (30) to the end of delivery line (13) .
c. Disconnect makeup line (4) from connector (2) at swing motor (1) .
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f. Connect portable hydraulic tester (8) between rear pump (21) and tee (3) .
g. Connect 6000 kPa (870 psi) pressure gauge (10) to pressure tap (15). This is used to
measure power shift pressure.
h. Connect 60000 kPa (8700 psi) pressure gauge (12) to pressure tap (11). This is used to
measure rear pump delivery pressure.
i. Install multitach group (20) to engine (19). This is used to monitor engine speed.
j. Disconnect negative flow control line (9) from rear pump (21). Install seal (36) and plug
(18) to the end of negative flow control line (9) .
Test
Note: Perform the test for the front pump and the test for the rear pump one at a time.
I f pump flow does not increase as the valve is opened, shut the engine
off and determine what is preventing the pump from upstroking.
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2. Place the machine controls at the following settings: Power Mode, engine speed dial "10" and
AEC switch OFF.
Reference: Make reference to Testing And Adjusting, "Operational Checks" for engine rpm
settings.
Illustration 9 g00301843
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4. Start Service Mode and maintain power shift pressure at 2250 ± 50 kPa (325 ± 7 psi).
a. Depress the following three buttons on the operator monitor panel at the same time:
button for fine control (4), button for user mode (5) and travel alarm cancel switch (6).
Hold all three buttons down for at least three seconds.
Note: If more than ten seconds pass between pushing the buttons, the controller display
(1) will revert to the operation mode.
c. Input the service code "0E 32 3A". To increase the flashing character, push the button for
boom priority mode (2). To decrease the flashing character, push the button for swing
priority mode (3). To move the flashing character to the right, push the button for fine
control mode (4). To move the flashing character to the left, push the button for user
mode (5) .
d. Once the correct service code is entered into the controller display (1), the controller
display (1) will change to "10 -- 1" within approximately ten seconds.
e. This step is optional. Step 4.e may be substituted for Step 4.d. Once the correct
service code is entered into the controller display (1), depress the following three buttons
on the operator monitor panel at the same time: button for fine control (4), button for user
mode (5) and travel alarm cancel switch (6). Hold all three buttons down for at least three
seconds. The controller display (1) will change to "10 -- 1".
f. On the operator monitor panel, enter a fixed power shift pressure of 2250 ± 50 kPa (325 ±
7 psi) on the controller display (1). Adjust controller display (1) in order to attain a power
shift pressure of 2250 ± 50 kPa (325 ± 7 psi) on the pressure gauge at pressure tap (15) .
g. Move the flashing character to the far left. Increase the "1" to a "6".
h. Move the flashing character to the right and increase the "0" to a "6".
i. Move the flashing character to the right. The last four characters on the controller display
(1) will begin flashing. These characters represent the power shift pressure (kPa). Adjust
the last four characters to "2250". To increase the power shift pressure 10 kPa (1.5 psi),
push the button for boom priority mode (2). To decrease the power shift pressure 10 kPa
(1.5 psi), push the button for swing priority mode (3). To increase the power shift
pressure 200 kPa (29 psi), push the button for boom priority mode (2) and power mode
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switch (7) at the same time. To decrease the power shift pressure 200 kPa (29 psi), push
the button for swing priority mode (3) and power mode switch (7) at the same time.
Note: Always monitor the actual power shift pressure on pressure gauge (10) at pressure
tap (15). The actual power shift pressure must be 2250 ± 50 kPa (325 ± 7 psi) on the
pressure gauge.
Note: Refer to Service Manual, "Engine And Pump Electronic Control System" for
additional information on Service Mode.
Note: To prevent a change in power shift pressure during line relief valve adjustment, do
not turn the engine OFF.
5. In order to perform flow measurements for either one of the pumps, the other pump must not be
under load.
6. Turn valve (22) on portable hydraulic tester (8) clockwise. Record pump flow at each of the
following pressures in Table 1. Use pressure gauge (12) at pressure tap (14) to monitor front
pump delivery pressure or use pressure tap (11) to monitor rear pump delivery pressure.
Illustration 10 g00664635
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Table 1
Pump Flow Test
M easuring Points
Front
Flow measured Pump
liter/min (US gpm) Rear
Pump
Front
Flow corrected Pump
liter/min (US gpm) Rear
Pump
Note: Specifications for flow rates are based on an engine speed of 2200 rpm. To attain more accurate
test results, measured flow should be corrected with the following calculation.
Table 2
Measured flow x 2200 rpm
Corrected flow =
measured rpm
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Note: The pump flow changes approximately 4.5 L/min (1.2 US gpm) for each 100 kPa (14 psi) of
power shift pressure.
Copyright 1993 - 2023 Caterpillar Inc. Mon Feb 13 23:13:17 UTC-0400 2023
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Red privada para licenciados del SIS.
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