FITTING 2807180 - Caterpillar

Illustration 1 g01443776
Relief valve locations
(A) Boom cylinder line (rod end)
(B) Bucket cylinder line (head end)
(C) Main relief valve
(D) Stick cylinder line (head end)
(E) Boom cylinder line (head end)
(F) Bucket cylinder line (rod end)
(G) Stick cylinder line (rod end)
(H) Swing motor
(J) Swing (left)
(K) Swing (right)
(L) Pilot filter
(M) Pilot relief valve
(N) Travel motor (right)
(P) Right travel crossover relief valve for forward travel (upper valve)
(Q) Right travel crossover relief valve for reverse travel (lower valve)
(R) Left travel crossover relief valve for forward travel (upper valve)
(S) Left travel crossover relief valve for reverse travel (lower valve)
(T) Travel motor (left)
Table 1
Relief Valve Specifications Torque for Locknut
New
Rebuilt(1) Service Limit(2)
(C) Main relief valve 35000 500 kPa (5076 73 psi) 33000 to 35500 kPa (4785 to 5150 psi) 50 10 N m (37 7 lb ft)
36000 500 kPa (5221 73 psi)
(Heavy Lift (if equipped)) 34000 to 36500 kPa (4930 to 5300 psi) 69 10 N m (51 7 lb ft)
(E) Boom cylinder line (head end) 39500 500 kPa (5729 + 73 psi) 32800 kPa (4757 psi) 20 2 N m (14 1 lb ft)
(G) Stick cylinder line (rod end)
(A) Boom cylinder line (rod end) 38000 500 kPa (5511 73 psi) 32800 kPa (4757 psi)
(B) Bucket cylinder line (head end)
(F) Bucket cylinder line (rod end)
(D) Stick cylinder line (head end) 38500 500 kPa (5584 73 psi) 32800 kPa (4757 psi)
(K) Swing relief pressure (right) 26000 1000 kPa (3770 145 psi) 120 10 N m (85 7 lb ft)
(J) Swing relief pressure (left)
(R) Left travel crossover relief valve (forward)(3) 35300 100 kPa (5120 15 psi) 31100 kPa (4511 psi) Not adjustable
(S) Left travel crossover relief valve (reverse)(3)
(P) Right travel crossover relief valve (forward)(3)
(Q) Right travel crossover relief valve (reverse)(3)
(M) Pilot relief valve 4100 200 kPa (595 29 psi) 50 5 N m (36 4 lb ft)
(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 these problems: improper adjustment, wear, damage of relief valves and damage of pumps.
(3) Do not adjust the crossover relief valves. Warranty will be voided if the crossover relief valves are adjusted.
Table 2
Required Tools
Part Number Description Qty
9U-7400 Multitach Tool Group 1
8T-0470 Thermometer Group 1
Table 3
Relief Valves Pressure change With One Turn Of Adjustment Screw
Main valves 14400 kPa (2100 psi)
Line relief valve 11000 kPa (1600 psi)
Swing relief valve 6800 kPa (985 psi)
Pilot relief valve 620 kPa (90 psi) Note: Pressure values in Table 3 are approximate values. Use a pressure gauge for adjustment.Note: Normal operations of the engine and pumps are necessary for the pressure adjustments. If the results of the pressure adjustment are not correct, then check the