INSERT 3873219 - Caterpillar

Relief Valve Settings
Illustration 1 g03778698
Relief valve locations
(1) Main relief valve
(2) Boom cylinder line (head end)
(3) Main control valve
(4) Stick cylinder line (rod end)
(5) Bucket cylinder line (head end)
(6) Attachment retract
(7) Boom cylinder line (rod end)
(8) Stick cylinder line (head end)
(9) Bucket cylinder line (rod end)
(10) Attachment extend
(11) Swing motor
(12) Swing (right)
(13) Swing (left)
(14) Travel motor (right)
(15) Travel motor (left)
(16) Right travel crossover relief valve for forward travel (upper valve)
(17) Right travel crossover relief valve for reverse travel (lower valve)
(18) Left travel crossover relief valve for forward travel (upper valve)
(19) Left travel crossover relief valve for reverse travel (lower valve)
Table 1
Relief Valve Engine Speed New (1) Service Limit(2)
Main Implement Speed Dial "10"
AEC switch OFF 30500 + 500 - 1500 kPa (4424 + 73 - 218 psi) 30500 + 500 - 2000 kPa (4424 + 73 - 290 psi)
Travel 30500 + 500 - 1500 kPa (4424 + 73 - 218 psi) 30500 + 500 - 2000 kPa (4424 + 73 - 290 psi)
Blade 20600 500 kPa (2988 73 psi) 20600 + 500 - 2000 kPa (2988 + 73 - 290 psi)
Boom Head End Speed Dial "10"
AEC switch OFF 32000 500 kPa (4641 73 psi) 28300 kPa (4105 psi)
Rod End 32000 500 kPa (4641 73 psi) 28300 kPa (4105 psi)
Stick Head End Speed Dial "10"
AEC switch OFF 32000 500 kPa (4641 73 psi) 28300 kPa (4105 psi)
Rod End 32000 500 kPa (4641 73 psi) 28300 kPa (4105 psi)
Bucket Head End Speed Dial "10"
AEC switch OFF 29800 kPa (4322 psi) 28300 kPa (4105 psi)
Rod End 29800 kPa (4322 psi) 28300 kPa (4105 psi)
Swing Right Speed Dial "10"
AEC switch OFF 29000 1000 kPa (4206 145 psi) 29000 + 1000 - 2000 kPa (4206 + 145 - 290 psi)
Left
Left Crossover Forward Speed Dial "10"
AEC switch OFF 32000 500 kPa (4641 73 psi) 28300 kPa (4105 psi)
Reverse
Right Crossover Forward
Reverse
Margin Neutral lever Speed Dial "10"
AEC switch OFF 1500 100 kPa (218 15 psi)
Pilot Spin Turn Speed Dial "10"
AEC switch OFF 1500 50 kPa (218 7 psi)
Full Lever Speed Dial "10"
AEC switch OFF 4100 200 kPa (595 29 psi)
(1) A New specification is the performance that can be expected for a new machine.
(2) Performance beyond “Service Limit” specifications is an indication of the following problems: improper adjustment, wear, damage of relief valves and damage of pumps.
Table 2
Relief Valves Pressure change With One Turn Of Adjustment Screw(1) Torque for Locknut
Main valve 22000 kPa (3191 psi) 9.5 1 N