STEM 1536339 - Caterpillar

Illustration 1 g02267353
Relief valve locations (1) Cab (2) Right swing motor (3) Left swing motor (4) Main control valve (5) Pilot manifold (6) Travel motor (right) (7) Travel motor (left) (A) Stick cylinder line (rod end) (B) Boom cylinder line (rod end) (C) Bucket cylinder line (rod end) (D) Signal relief valve (low pressure) (E) Signal relief valve (high pressure) (F) Stick cylinder line (head end) (G) Boom cylinder line (head end) (H) Bucket cylinder line (head end) (J) Right swing motor (right relief valve) (K) Right swing motor (left relief valve) (L) Left swing motor (right relief valve) (M) Left swing motor (left relief valve) (N) Margin pressure adjustment screw (rear pump) (P) Margin pressure adjustment screw (front pump) (R) Pilot relief valve (S) Right travel crossover relief valve for forward travel (upper valve) (T) Right travel crossover relief valve for reverse travel (lower valve) (U) Left travel crossover relief valve for reverse travel (lower valve) (V) Left travel crossover relief valve for forward travel (upper valve) (W) Differential relief valve (X) Differential relief valve (Y) Control valve for counterweight cylinder
Table 1
Relief Valve    Specifications    Torque For Locknut    
New Rebuild    Service Limit    
Signal relief valve (low pressure)    
32000 + 500 - 1000 kPa (4641 + 73 - 145 psi)    
32000 + 500 - 2000 kPa (4641 + 73 - 290 psi)    
60 10 N m (45 8 lb ft)    
Signal relief valve (high pressure)    
35000 + 500 - 1000 kPa (5076 + 73 - 145 psi)    
35000 + 500 - 2000 kPa (5076 + 73 - 290 psi)    
Margin pressure adjustment screw (rear pump)    
1960 50 kPa (285 7 psi)    
1960 50 kPa (285 7 psi)    
28 7 N m (21 5 lb ft)    
Margin pressure adjustment screw (front pump)    
Boom cylinder line (head end)    
37000 + 500 - 1000 kPa (5366 + 73 - 145 psi)    
37000 + 500 - 2000 kPa (5366 + 73 - 290 psi)    
33 10 N m (24 7 lb ft)    
Boom cylinder line (rod end)    
34000 + 500 - 1000 kPa (4931 + 73 - 145 psi)    
34000 + 500 - 2000 kPa (4931 + 73 - 290 psi)    
Stick cylinder line (head end)    
34000 + 500 - 1000 kPa (4931 + 73 - 145 psi)    
34000 + 500 - 2000 kPa (4931 + 73 - 290 psi)    
Stick cylinder line (rod end)    
37000 + 500 - 1000 kPa (5366 + 73 - 145 psi)    
37000 + 500 - 2000 kPa (5366 + 73 - 290 psi)    
Bucket cylinder line (head end)    
34000 + 500 - 1000 kPa (4931 + 73 - 145 psi)    
34000 + 500 - 2000 kPa (4931 + 73 - 290 psi)    
Bucket cylinder line (rod end)    
Right swing motor (right relief valve)