CONTROLLER 4333772 - Caterpillar

Illustration 1 g06274060
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 Machine Settings New
Rebuild(1) Service Limit(2)
Main Implement Speed Dial "10"
AEC switch OFF 35000 500 kPa (5076 73 psi) 35000 500 kPa (5076 73 psi)
Travel
Boom Head End Speed Dial "10"
AEC switch OFF 37000 500 kPa (5366 73 psi) ≥ 34300 kPa (4975 psi)
Rod End 37000 500 kPa (5366 73 psi) ≥ 34300 kPa (4975 psi)
Stick Head End Speed Dial "10"
AEC switch OFF 37000 500 kPa (5366 73 psi) ≥ 34300 kPa (4975 psi)
Rod End 37000 500 kPa (5366 73 psi) ≥ 34300 kPa (4975 psi)
Bucket Head End Speed Dial "10"
AEC switch OFF 27500 1000 kPa (3989 145 psi)
Rod End 29900 1000 kPa (4337 145 psi)
Swing Right Speed Dial "10"
AEC switch OFF 24550 1000 kPa (3561 145 psi)
Left
Left Crossover Forward Speed Dial "10"
AEC switch OFF 39700 1960 kPa (5758 284 psi)(3) ≥ 36800 kPa (5337 psi)
Reverse
Right Crossover Forward
Reverse
Pilot 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. 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 Locknut
Main valve 4430 kPa (650 psi) 29.4 2 N m (21.7 1.5 lb ft)
Line relief valve 17600 kPa (2550 psi) 27 1.5 N m (19.9 1.1 lb ft)
Swing relief valve 6000 kPa (875 psi) 80 8 N m (60 6 lb ft)
Pilot relief valve 620 kPa (90 psi) 49 5 N m (36 4 lb ft)
(1) Pressure values are approximate values. Use a pressure gauge for adjustment.