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SLEEVE 4Z8421 - Caterpillar



4Z8421 SLEEVE Caterpillar parts SLEEVE
Rating:
26
Alternative (cross code) number:
CA4Z8421
4Z-8421
4Z8421
Caterpillar 4Z8421 SLEEVE
Weight: 0.50 pounds 0 kg.

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Information:

Specification
Table 1
"Power Shift Pressure - Check"
Item Machine Settings Specification Commanded(1) Actual(2)
Power Shift Pressure
(No Load) Speed Dial "10"
AEC switch OFF 3400 250 kPa (493 36 psi)
Power Shift Pressure
(Full Load) Speed Dial "10"
AEC switch OFF 1000 300 kPa (145 44 psi)
(1) Value from the monitor
(2) Value from the pressure gaugeIntroduction
The power shift pressure check insures the commanded power shift pressure matches the actual power shift pressure during a two pump stall condition.Preliminary Tests
Testing and Adjusting, "Relief Valve (Pilot) - Test and Adjust"
Testing and Adjusting, "Relief Valve (Main) - Test and Adjust"
Testing and Adjusting, "Solenoid Valve (Proportional Reducing) - Calibrate (Power Shift Pressure)"Required Tools
Illustration 1 g02726620
Table 2
Tool Item Qty Part No Description
B B1 1 8T-0856 Pressure Gauge
6000 kPa (870 psi)
B2 1 6V-3989 Fitting
B3 2 6V-4143 Quick Connect Coupler
B4 1 177-7862 Hose As
5.5 m (18 ft) Machine Preparation
Position the machine on level ground and stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".
Illustration 2 g03645902
Pump compartment
(1) Pressure tap (delivery pressure for drive pump)
(2) Pressure tap (delivery pressure for idler pump)
(3) Pressure tap (power shift pressure)
Connect a 6000 kPa (870 psi) pressure gauge to pressure tap (3) to monitor power shift pressure. Test Procedure
Start the engine.
Increase the hydraulic oil temperature to 55° 5°C (131° 9°F).
Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.
Check the commanded power shift pressure on the monitor. Check the actual power shift pressure at pressure tap (3). Refer to Table 1 for the specification.
Move the joystick for the boom until the boom is at the full BOOM RAISE position (full extension of boom cylinders). Hold the joystick for the boom in this position.
Check the commanded power shift pressure on the monitor. Check the actual power shift pressure at pressure tap (3). Refer to Table 1 for the specification.
Return the joystick to the NEUTRAL position.
If the power shift pressure is not within specification, proceed to Testing and Adjusting, "Main Pump (Flow) - Test (Hydraulic Power)".


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