BOSS 2112326 - Caterpillar

Illustration 1 g01420103
Relief valve locations (A) Main relief valve (B) Boom cylinder line (head end) (C) Boom cylinder line (rod end) (D) Stick cylinder line (head end) (E) Stick cylinder line (rod end) (F) Work tool cylinder (head end) (G) Work tool cylinder (rod end) (H) Grapple cylinder (head end) (I) Grapple cylinder (rod end) (J) Swing motor (K) Swing (left) (L) Swing (right) (M) Pilot relief valve (N) Pilot filter (O) 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 (2) Service Limit (3)    
(A) Main relief valve     35000 500 kPa (5100 73 psi)    
33000 to 35500 kPa (4800 to 5150 psi)    
69 10 N m (51 7 lb ft)    
36000 500 kPa (5221 72 psi)
(Heavy Lift)
34000 to 36500 kPa (4930 to 5295 psi)    
50 10 N m (37 7 lb ft)    
(B) Boom cylinder line (head end)    
38000 + 1500 - 500 kPa (5500 + 218 - 73 psi)    
20 2 N m (14 1 lb ft)    
(E) Stick cylinder line (rod end)    
(C) Boom cylinder line (rod end)    
37000 + 1500 - 500 kPa (5350 + 218 - 73 psi)    
(D) Stick cylinder line (head end)    
(F) Work tool cylinder (head end)    
(G) Work tool cylinder (rod end)    
(H) Grapple cylinder (head end)    
27500 1000 kPa (4000 145 psi)    
25500 to 28000 kPa (3700 to 4060 psi)    
(I) Grapple cylinder (rod end)    
(K) Swing relief pressure (left)    
26000 1000 kPa (3750 145 psi)    
120 10 N m (85 7 lb ft)    
(L) Swing relief pressure (right)    
(P) Right travel crossover relief valve (forward)    
34000 1500 kPa (4930 220 psi)    
31000 to 37000 kPa (4500 to 5370 psi)    
130 13 N m (95 10 lb ft)    
(Q) Right travel crossover relief valve (reverse)    
(R) Left travel crossover relief valve (forward)    
(S) Left travel crossover relief valve (reverse)    
(M) Pilot relief valve    
4100 200 kPa (595 30 psi)    
50 5 N m (36 4 lb ft)    
( 2 ) 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.
( 3 ) Performance beyond Service Limit specifications is an indication of these problems: improper adjustment , wear , damage of relief valves and damage of pumps.
Table 2
Required Tools    
Part Number     Description     Qty