538 Forest Machine Machine Systems Caterpillar

Specifications

Usage:

538 GMY

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Illustration 1	g06051234
Relief valve locations (A) Main relief valve (C) Line relief valve (boom cylinder head end) (D) Line relief valve (stick cylinder head end) (E) Line relief valve (stick cylinder rod end) (F) Line relief valve (bucket cylinder head end) (G) Line relief valve (bucket cylinder rod end) (H) Line relief valve for grapple saw (grapple CLOSE) (J) Line relief valve for grapple saw (grapple OPEN) (K) Pilot relief valve (L) Pilot filter (M) Swing motor (N) Swing (left) (P) Swing (right) (R) Travel motor (right) (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 forward travel (upper valve) (V) Left travel crossover relief valve for reverse travel (lower valve) (W) Travel motor (left)

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Table 1
Relief Valve	Specifications		Torque for Locknut
Relief Valve	538 GF	538 LL	Torque for Locknut
(A) Main relief valve	35000 ± 500 kPa (5076 ± 73 psi)	35000 ± 500 kPa (5076 ± 73 psi)	69 ± 10 N·m (51 ± 7 lb ft)
(A) Main relief valve	38000 ± 500 kPa (5512 ± 73 psi)⁽¹⁾	38000 ± 500 kPa (5512 ± 73 psi)⁽¹⁾	50 ± 10 N·m (37 ± 7 lb ft)
(B) Line relief valve (boom cylinder rod end)	37000 + 1500 - 500 kPa (5366 + 218 -73 psi)	37000 + 1500 - 500 kPa (5366 + 218 -73 psi)	20 ± 2 N·m (14 ± 1 lb ft)
(C) Line relief valve (boom cylinder head end)	40000 + 1500 - 500 kPa (5802 + 218 - 73 psi)	40000 + 1500 - 500 kPa (5802 + 218 - 73 psi)
(D) Line relief valve (stick cylinder head end)	37000 + 1500 - 500 kPa (5366 + 218 -73 psi)	37000 + 1500 - 500 kPa (5366 + 218 -73 psi)
(E) Line relief valve (stick cylinder rod end)	40000 + 1500 - 500 kPa (5802 + 218 - 73 psi)	40000 + 1500 - 500 kPa (5802 + 218 - 73 psi)
(F) Line relief valve (heel cylinder head end)	37000 + 1500 - 500 kPa (5366 + 218 - 73 psi)	37000 + 500 - 2000 kPa (5366 + 73 - 290 psi)
(G) Line relief valve (heel cylinder rod end)	37000 + 1500 - 500 kPa (5366 + 218 - 73 psi)	37000 + 500 - 2000 kPa (5366 + 73 - 290 psi)
(H) Line relief valve head end (thumb/grapple CLOSE)	27500 + 1500 - 500 kPa (3989 + 218 - 73 psi)⁽²⁾	27500 + 1500 - 500 kPa (3989 + 218 - 73 psi)⁽³⁾
(J) Line relief valve rod end (thumb/grapple OPEN)	27500 + 1500 - 500 kPa (3989 + 218 - 73 psi)⁽²⁾	27500 + 1500 - 500 kPa (3989 + 218 - 73 psi)⁽³⁾
Line relief valve for grapple (grapple rotator COUNTERCLOCKWISE)		10335 ± 345 kPa (1499 ± 50 psi)
Line relief valve for grapple (grapple rotator CLOCKWISE)		10335 ± 345 kPa (1499 ± 50 psi)
(K) Pilot relief valve	4100 ± 200 kPa (595 ± 30 psi)		50 ± 5 N·m (36 ± 4 lb ft)
(N) Swing relief pressure (left)	31000 ± 1000 kPa (4496 ± 145 psi)	31000 ± 1000 kPa (4496 ± 145 psi)	120 ± 10 N·m (85 ± 7 lb ft)
(P) Swing relief pressure (right)	31000 ± 1000 kPa (4496 ± 145 psi)	31000 ± 1000 kPa (4496 ± 145 psi)	120 ± 10 N·m (85 ± 7 lb ft)
(S) Right travel crossover relief valve (forward)	37500 + 1500 - 500 kPa (5439 + 218 - 73 psi)	37500 + 1500 - 500 kPa (5439 + 218 - 73 psi)	130 ± 13 N·m (95 ± 10 lb ft)
(T) Right travel crossover relief valve (reverse)
(U) Left travel crossover relief valve (forward)
(V) Left travel crossover relief valve (reverse)

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⁽¹⁾	Heavy lift
⁽²⁾	Thumb Cylinder for 538 GF
⁽³⁾	Grapple Cylinder for 538 LL

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Table 2
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)
Travel crossover relief valve	3050 kPa (440 psi)
Pilot relief valve	620 kPa (90 psi)

Note: Pressure values in Table 2 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 the engine and the pump characteristic curve needs to be checked. Slow output flow from the pump is an indication of air in the hydraulic system. Make sure that no air is present in the hydraulic system. Refer to Testing and Adjusting, "Main Hydraulic Pump Air - Purge".