RECTIFIER 5027400 - Caterpillar

Relief Valve Settings
Illustration 1 g06274047
Relief valve locations
(1) Main relief valve
(2) Boom cylinder line (head end)
(3) Boom cylinder line (rod end)
(4) Stick cylinder line (head end)
(5) Stick cylinder line (rod end)
(6) Bucket cylinder line (head end)
(7) Bucket cylinder line (rod end)
(8) Swing (right)
(9) Swing (left)
(10) Left travel crossover relief valve for forward travel (upper valve)
(11) Left travel crossover relief valve for reverse travel (lower valve)
(12) Right travel crossover relief valve for forward travel (upper valve)
(13) Right travel crossover relief valve for reverse travel (lower valve)
(14) Pilot relief valve
(15) Main control valve
(16) Pilot filter
(17) Travel motor (right)
(18) Travel motor (left)
(19) Swing motor
Table 1
Relief Valve New
Rebuild(1) Service Limit(2)
Engine Speed
Main Implement Speed Dial "10"
AEC switch OFF 30500 500 kPa (4424 73 psi) 30500 + 500 - 2000 kPa
(4424 + 73 - 290 psi)
Travel 35000 500 kPa (5076 73 psi) 35000 + 500 - 2000 kPa
(5076 + 73 - 290 psi)
Boom Head End Speed Dial "10"
AEC switch OFF 32000 500 kPa (4641 73 psi) 32000 1500 kPa
(4641 290 psi)
Rod End 32000 500 kPa (4641 73 psi) 32000 1500 kPa
(4641 290 psi)
Stick Head End Speed Dial "10"
AEC switch OFF 32000 500 kPa (4641 73 psi) 32000 1500 kPa
(4641 290 psi)
Rod End 32000 500 kPa (4641 73 psi) 32000 1500 kPa
(4641 290 psi)
Bucket Head End Speed Dial "10"
AEC switch OFF 28500 500 kPa (4134 73 psi) 28500 + 1500 - 2000 kPa
(4134 + 215 - 290 psi)
Rod End 32000 500 kPa (4641 73 psi) 32000 1500 kPa
(4641 290 psi)
Swing Right Speed Dial "10"
AEC switch OFF 24500 1000 kPa (3553 145 psi)
Left
Left Crossover Forward Speed Dial "10"
AEC switch OFF 40000 1500 kPa (5802 218 psi) (3) ≥ 36800 kPa (5337 psi)
Reverse
Right Crossover Forward
Reverse
Pilot Speed Dial "10"
AEC switch OFF 4100 200 kPa (595 29 psi)
Demolition Bucket Head End Speed Dial "10"
AEC switch OFF 24500 1000 kPa (3553 145 psi) 23500 + 1500 - 2000 kPa
(4424 + 218 - 290 psi)
Rod End Speed Dial "10"
AEC switch OFF 24500 1000 kPa (3553 145 psi) 23500 + 1500 - 2000 kPa
(4424 + 218 - 290 psi)
(1) A New specification is the performance that can be expected for a new machine. A “Rebuild” specification is the performance that can be expected after rebuilding the components of a system.
(2) Performance beyond “Service Limit” specifications is an indication of the following problems: improper adjustment, wear, damage of relief valves and damage of pumps.
(3) The crossover relief valve pressure specifications are set above the maximum limit of the main relief valve and can not be measured on this machine. The minimum pressure specification is used to verify that the crossover relief valve is within the service limits.
Table 2
Relief Valves Pressure change With One Turn Of Adjustment Screw(1) Torque for