330bl NFC Adjust

2015/09/28 Pump Control (Negative Flow) - Test (RENR3201-04)
SMCS - 3222 i00992311
Illustration 1 g00505852
Flow meter tool layout
(1) Swing motor
(2) Connector at swing motor
(3) 6V-9840 Swivel Tee
(4) Makeup line
(6) 6V-9512 Plug
(7) Negative flow control line (upper pump)
(10) 6V-9508 Plug
(12) 4C-9910 Portable hydraulic tester (flow meter)
(16) Delivery line for main pump
(18) Upper pump
(20) Negative flow control line (lower pump)
(22) Lower pump
(30) 5K-9090 O-Ring seal
(31) 5P-0201 Hose
(32) 5P-1010 Sleeve
(33) 4C-8767 Coupling
(34) 7M-8484 O-Ring seal
(35) 4C-6481 Coupler assembly
(36) 4C-6482 Nipple assembly
(37) 4I-6141 Coupling assembly
(38) 8C-9026 Adapter
(39) 6K-6307 O-Ring seal
(40) 6V-9854 Swivel elbow
(42) 6V-8397 O-Ring seal
Tool setup
(8) 8T-0861 Pressure gauge
(9) Pressure tap (upper pump delivery pressure)
(13) Pressure tap (pilot oil manifold)
(14) 8T-8902 Tee
(19) 8T-0856 Pressure gauge
(20) 6V-3989 Unvalved nipple
(21) 6V-4143 Coupler assembly
(27) 6V-9508 Plug
(28) Test port (negative flow control)
(29) 6V-3014 Hose
(41) 6V-9829 Cap
(43) 3J-1907 O-Ring seal
(45) 6V-3965 Nipple assembly
Pilot oil manifold
(11) Pilot oil manifold
(13) Pressure tap
(25) Pilot relief valve
Swing motor (top view)
(1) Swing motor
(2) Connector
(4) Makeup line
Portable hydraulic tester (flow meter)
(12) Portable hydraulic tester (flow meter)
(23) Multitach
(26) Valve
Circuit Diagram
(1) Swing Motor
(2) Connector
(3) Tee
(4) Makeup line
(5) Main control valves
(6) Plug
(8) Pressure gauge
(10) Plug
(11) Pilot oil manifold
(12) Portable hydraulic tester (flow meter)
(13) Pressure tap
(14) Tee
(15) Delivery line (lower pump)
(16) Delivery line (upper pump)
(17) Test hose
(18) Upper pump
(19) Pressure gauge
(21) Pressure tap (lower pump delivery pressure)
(22) Lower pump
(23) Multitach group
(24) Engine
(27) Plug
(28) Negative flow signal pressure port
(41) Cap
(44) Negative flow signal pressure port
(46) Test hose
Preparation
NOTICE
Care must be taken to ensure that fluids are contained during
performance of inspection, maintenance, testing, adjusting and
repair of the product. Be prepared to collect the fluid with
suitable containers before opening any compartment or
disassembling any component containing fluids.
Refer to Special Publication, NENG2500, "Caterpillar Tools and

Shop Products Guide" for tools and supplies suitable to collect
and contain fluids on Caterpillar products.
Dispose of all fluids according to local regulations and

mandates.
Upper Pump
Pump compartment


(16) Delivery line (upper pump)
(18) Upper pump
(22) Lower pump
1. Position the machine on level ground.
2. Stop the engine.
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 circuit diagram. Refer to Illustration 6.
a. Disconnect delivery line (16) from upper pump (18).
b. Install plug (6) and seal (30) to the end of delivery line (16).
c. Disconnect makeup line (4) from swing motor (1).
d. Install tee (3) to connector (2) of swing motor (1).
e. Connect makeup line (4) to tee (3).
f. Connect portable hydraulic tester (12) between upper pump (18) and makeup line (4).
g. Connect 60000 kPa (8700 psi) pressure gauge (8) to pressure tap (9) for upper pump delivery
pressure.
h. Install multitach group (23) on engine (24). This is used to monitor engine speed.
i. Disconnect negative flow control line (7) from upper pump (18). Install plug (10) and seal (42)
to the end of negative flow control line (7).
j. Connect one end of test hose (17) to negative flow signal pressure port (28) of upper pump
(18).
k. Install tees (14) to the other end of test hose (17). Refer to Illustration 6.
l. Connect a 6000 kPa (870 psi) pressure gauge (19) to tee (14).
m. Connect one end of test hose (46) to pressure tap (13) of pilot oil manifold (11). Connect the
other end of test hose (46) to tee (14).
Lower Pump
Pump compartment

(15) Delivery line (lower pump)

(18) Upper pump
(21) Pressure tap (lower pump delivery pressure)
(22) Lower pump
1. Position the machine on level ground.
2. Stop the engine.
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 circuit diagram. Refer to Illustration 6.
a. Disconnect delivery line (15) from lower pump (22).
b. Install plug (6) and seal (30) to the end of delivery line (15).
c. Disconnect makeup line (4) from swing motor (1).
d. Install tee (3) to connector (2) of swing motor (1).
e. Connect makeup line (4) to tee (3).
f. Connect portable hydraulic tester (12) between lower pump (22) and makeup line (4).
g. Connect 60000 kPa (8700 psi) pressure gauge (8) to pressure tap (21) for lower pump delivery
pressure.
h. Install multitach group (23) on engine (24). This is used to monitor engine speed.
i. Disconnect negative flow control line (20) from lower pump (22). Install plug (10) and seal (42)
to the end of negative flow control line (20).
j. Connect one end of test hose (17) to negative flow signal pressure port (44) of lower pump
(22).
k. Install tees (14) to the other end of test hose (17). Refer to Illustration 6.
l. Connect a 6000 kPa (870 psi) pressure gauge (19) to tee (14).
m. Connect one end of test hose (46) to pressure tap (13) of pilot oil manifold (11). Connect the
other end of test hose (46) to tee (14).
Test
Note: Perform the test for the upper pump and the test for the lower pump one at a time.
To prevent personal injury or equipment damage from failure of

the hydraulic test equipment or associated circuit components
because of blocked pump flow, make sure that the test
equipment valves are fully open before starting the engine.
To prevent personal injury and/or equipment damage from failed

lines or components while the hydraulic test equipment is
returned to the open flow position, slowly open the hydraulic
test equipment valve while monitoring the pump flow.
If pump flow does not increase as the valve is opened, shut the
engine off and determine what is preventing the pump from
upstroking.
1. Start the engine.
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.
3. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

4. Turn valve (26) on portable hydraulic tester (12) clockwise until the pump delivery pressure is
6850 kPa (1000 psi).
5. Adjust pilot relief valve (25) on pilot oil manifold (11) until pressure gauge (19) that is connected to
tee (14) indicates 2650 kPa (385 psi).
6. Record the negative flow at 2650 kPa (385 psi) in Table 1.
P-Q characteristic curve
Table 1
Negative Flow Control at 2650 kPa (385 psi)
6DR1-1582
Oil Temperature °C (°F)
Engine speed (rpm)
Upper pump
Flow measured liter/min (US gpm)
Lower pump
Flow corrected liter/min (US gpm) Upper pump
Lower pump
New 96 ± 10 (25.3 ± 2.6)
Specification for negative flow rate liter/min (US gpm)
Service limit 80 (21)
Note: Specifications for flow rates are based on an engine speed of 1800 rpm. To get more accurate
test results, measured flow should be corrected with the following calculation.
Table 2
Measured flow x 1800 rpm
Corrected flow =
Measured rpm
Flow measurements must be done in pressure rise.
PSP-0005C6FA
2023/01/07
07:27:23+03:00
i00992311
© 2023 Caterpillar Inc.
Caterpillar:
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What tools are needed to perform the negative flow control test?

What tools are needed to perform the negative flow control test?

What are the steps to perform the negative flow control test on the upper pump?

What are the steps to perform the negative flow control test on the upper pump?

2015/09/28 Pump Control (Negative Flow) - Test (RENR3201-04)

SMCS - 3222 i00992311

Refer to Special Publication, NENG2500, "Caterpillar Tools and

Dispose of all fluids according to local regulations and

(7) Negative flow control line (upper pump)

2. Stop the engine.

a. Disconnect delivery line (16) from upper pump (18).

c. Disconnect makeup line (4) from swing motor (1).

d. Install tee (3) to connector (2) of swing motor (1).

e. Connect makeup line (4) to tee (3).

(15) Delivery line (lower pump)

1. Position the machine on level ground.

2. Stop the engine.

a. Disconnect delivery line (15) from lower pump (22).

c. Disconnect makeup line (4) from swing motor (1).

d. Install tee (3) to connector (2) of swing motor (1).

e. Connect makeup line (4) to tee (3).

To prevent personal injury or equipment damage from failure of

To prevent personal injury and/or equipment damage from failed

1. Start the engine.

3. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

6. Record the negative flow at 2650 kPa (385 psi) in Table 1.

Negative Flow Control at 2650 kPa (385 psi)

Flow measurements must be done in pressure rise.

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