UPPERSTRUCTURE / Pilot Valve Assemble Travel Pilot Valve IMPORTANT: Check the direction to install spring guide (17). 1. Assemble spools (24) (4 used) into the assembly. Insert spacers (26) (2 used), shims (27) (12 used) and balance springs (18) (4 used) into spools (24) (4 used) in this order. Install shim (27) as the same condition before disassembling. Push balance springs (18) (4 used) by hand. Install spring guides (17) (4 used) to spools (24) (4 used) with the stepped-end facing downward. IMPORTANT: Before inserting the parts into holder (7) and casing (23), apply hydraulic oil onto the parts. 2. Insert return springs (25) (4 used) into casing (23). 3.
Insert the spool (24) assembly into the former port before disassembling. Turn and install the spool (24) assemblies (4 used) into casing (23). 4. Assemble pushers (16) (4 used) into the assembly. Install oil seals (28) (4 used) to bushings (15) (4 used). Apply grease to the inner surface of oil seals (28) (4 used). Install O-rings (14) (4 used) to bushings (15) (4 used). Insert pushers (16) (4 used) into bushings (15) (4 used). Apply grease to the head of pushers (16) (4 used). 5. Insert the pushers (16) (4 used) assembly into casing (23). 6.
If bushing (6) has been removed from holder (7), install bushings (6) (4 used) to holder (7) by using special tool (ST 7256) in the following procedures. NOTE: Bushings (6)(4 used) are identical. Insert bushings (6) (4 used) into special tool (ST 7256). Tap special tool (ST 7256) and install bushing (6) into the hole of holder (7) by using a hammer. Stop tapping when the bushing (6) end is flush with the inside wall. ST 7256 7 6 W176-02-11-310 Install bushing (6) on the opposite side in the same procedure. ST 7256 7 6 W176-02-11-311 Install bushing (6) in near side as illustrated. Stop tapping when the bushing (6) end is flush with the outside of holder (7).
ST 7256 Outside of Holder W176-02-11-312 Install bushing (6) in the near and opposite side as illustrated. 6 7 ST 7256 W176-02-11-313 W2-7-31 6 7 6 7