UPPERSTRUCTURE / Pilot Valve Assemble Right and Left Pilot Valves IMPORTANT: The pilot valve is susceptible to contamination. Keep the parts clean when assembling. IMPORTANT: Refer to the table in left in order to assemble them correctly. 3. Install spacers (1) (4 used), shim (2) and balance springs (3, 4) (2 used for each) to spools (19) (4 used). Install return springs (5, 6) (2 used for each) to casing (18). 4. Install spring guides (7) (4 used) onto return springs (5, 6) (2 used for each) with the protrusion facing upward. 5. Install special tool (ST 4146) to the pusher (9, 10) hole on casing (18). Secure special tool (ST 4146) by using the bolts (M14, Pitch 2.0 mm). NOTE:
Table below shows the relations between each port and the components. Do not confuse them when assembling. : 12 mm ST 4146 1. Insert same spools (19) (4 used) before disassembling to the port hole (4 places) on casing (18). ST 4144 W178-02-07-049 6. Install retaining ring (8) to ring holder (ST 4144). ST 4145 NOTE: Spool (19) and casing (18) must be replaced as an assembly. 2. Install special tool (ST 4145) to the port hole on casing (18). : 6 mm W2-7-23 Port No. Spool (19) Shim (2) Pushers A, B (9, 10) 1 Same to the former one Same to the former one Outer grooves (3 used) 2 Without outer groove 3 Outer grooves (3 used) 4 Without outer groove Port No.
Return Springs (5, 6) Balance Springs A, B (3, 4) 1 Short Short 2 Long Long 3 Short Short 4 Long Long