PIN 5A5465 - Caterpillar

Specification
Table 1
Main Pump Cutoff Pressure    
Date    Machine Serial Number    
Machine Settings     Engine Speed    
Speed Dial "10"
AEC switch OFF
Item     Specification     Actual    
Main pump cutoff pressure     28500 350 kPa (4134 51 psi)        Introduction
Cutoff Pressure is the maximum pressure that can exist in the main hydraulic system before the hydraulic pump destrokes, thus lowering system pressure. A low cutoff pressure setting can decrease performance of the implements. A high cutoff pressure could damage components. Use the following procedures to test or adjust the cutoff pressure.Required Tools
Table 2
Required Tools    
Part Number    Description    Qty    
198-4240     Digital Pressure Indicator Gp        
198-4234     Digital Indicator     1    
198-4238     Pressure Sensor Gp
34450 kPa (5000 psi)     1    
198-4236     Adapter Cable As     1    Machine Preparation
Position the machine on level ground.
Stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure-Release".
Illustration 1 g03261336
Main hydraulic pump (1) Pressure tap (pump cutoff pressure )
Illustration 2 g03261338
Main hydraulic pump (2) Pump cutoff pressure adjustmentNote: Pressure tap (1) of load sensing (LS) line is used to check cutoff pressure of main hydraulic pump.
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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Attach a 34450 kPa (5000 psi) pressure gauge to pressure tap (1) 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
Place the hydraulic activation control lever in the UNLOCKED position.
Move the joystick for the bucket until the bucket is at the full BUCKET OPEN position (full retraction of bucket cylinder). Hold the joystick for the bucket in this position.
Check the pressure reading for the pump cutoff pressure at pressure tap (1) .
Return the joystick for the bucket to the NEUTRAL position.
The pressure reading on the pressure gauge should be 28500 350 kPa (4134 51 psi), If the reading at pressure tap (1) is not within the specification, adjust the pump cutoff pressure.Adjustment Procedure
Illustration 3 g03261758
Pump cutoff pressure adjustment (3) Lock nut (4) Adjustment screw
Lower all implements to the ground.
Hold adjustment screw (4) with a hex wrench and loosen lock nut (3) with a combination wrench. Turn adjustment screw (4) counterclockwise in order to decrease the pressure setting and turn adjustment screw (4) clockwise in order to increase the setting. Note: Each complete revolution of the adjustment screw (4) in the clockwise direction will