583R Pipelayer Hydraulic System Caterpillar

Illustration 1	g00531680

(1) 1U-1788 Relief Valve for boom LOWER function:

Pressure setting (full flow) ... 10500 ± 345 kPa (1525 ± 50 psi)

Flow rate ... 530 ± 8 L/min (140 ± 2 US gpm)

(2) Main relief valve.

(3) 1U-1788 Relief Valve for hook LOWER function:

Pressure setting (full flow) ... 10500 ± 345 kPa (1525 ± 50 psi)

Flow rate ... 530 ± 8 L/min (140 ± 2 US gpm)

Illustration 2	g00531746

(4) 9J-8752 Spring (two)

Test length ... 81.0 mm (3.19 inch)

Test force ... 337 ± 17 N (75.8 ± 3.8 lb)

Free length after test ... 116.8 mm (4.6 inch)

Outside diameter ... 33.83 mm (1.332 inch)

(5) 8M-1679 Spring (two)

Test length ... 18.54 mm (.730 inch)

Test force ... 26.7 ± 2 N (6.0 ± 5 lb)

Free length after test ... 133.9 mm (5.27 inch)

Outside diameter ... 33.32 mm (1.312 inch)

(6) 2V-7249 Spring (two)

Test length ... 50.0 mm (1.97 inch)

Test force ... 80 ± 4 N (18.0 ± .9 lb)

Free length after test ... 70.0 mm (2.76 inch)

Outside diameter ... 20.16 mm (.794 inch)