631G and 637G Wheel Tractor-Scrapers Hydraulic System Caterpillar

Illustration 1	g00296335

(1) 9J-1330 Shim

Thickness ... 0.787 mm (0.0310 inch)

One shim will change the opening pressure. ... 792 kPa (115 psi)

Assemble shim (1) next to spring (4) .

(2) 8J-4452 Shim

Thickness ... 0.12 mm (0.005 inch)

One shim will change the opening pressure. ... 306 kPa (44 psi)

(3) Relief Valve

Relief setting for sequence pressure ... 6550 ± 1035 kPa (950 ± 150 psi)

Relief function for apron lower ... 16500 ± 170 kPa (2400 ± 25 psi)

Note: During the apron LOWER position, the main relief valve will relieve system pressure before the sequence and pressure control valve will relieve pressure.

(4) 4T-7292 Spring

Length under test force ... 58.7 mm (2.31 inch)

Test force ... 260 N (59 lb)

Free length after test ... 65.3 mm (2.57 inch)

Outside diameter ... 13.5 mm (0.53 inch)