UPPERSTRUCTURE / Pilot Valve Disassemble Right and Left Pilot Valves IMPORTANT: Casing (18) is made of aluminium. Too strong a force can deform or damage them. Be careful while handling them. IMPORTANT: Spool (19) has been selected to match the hole of casing (18). The dimensions of balance springs A (3), B (4) and return springs A (5), B (6) as well as those of pushers A (9), B (10) are different. Indicate the port number from which it is removed. Port numbers are stamped on the outer surface of casing (18). IMPORTANT: Do not remove screw joint (17) while clamping casing (18) in a vise. The strong torque may act on screw joint (17). 1. Clamp screw joint (17) in a vise.
Turn cam (16) by using a spanner. Remove screw joint (17). 3. Attach a spanner onto the upper part of universal joint (15) and remove universal joint (15). : 17 mm NOTE: Universal joint (15) has been secured on casing (18) by using LOCTITE #262. 4. Remove plate (14). IMPORTANT: Do not damage the surface of sleeve (12). Insert a soft rubber between sleeve (12) and the tool. Oil seal (11) cannot be removed from sleeve (12). Sleeve (12) and oil seal (11) must be replaced as an assembly. 5. Pull out sleeve (12) upward by using a pair of pliers. IMPORTANT: The dimensions of pushers (9, 10) for ports (1, 3) and ports (2, 4) are different.
Indicate the port number from which it is removed in order to keep by the port number. 6. Remove pushers (9, 10) from casing (18). : 19 mm, 32 mm 2. Clamp the flat surface of casing (18) in a vise lightly. Remove cam (16) from universal joint (15). : 32 mm W2-7-19