Disassembly And Reassembly Of The Control Valve Section - Hitachi NR 90AD Technical Data And Service Manual

10-3. Disassembly and Reassembly of the Control Valve Section (See Fig. 15.)
[Tools required]
Flat-blade screwdriver
Roll pin puller (3 mm (0.118") dia.)
(a) Disassembly
Remove the Retaining Ring (E-type) for D6 Shaft [22] with blade of a screwdriver and pull out Change Knob
(C) [46] being careful not to lose the Steel Ball D3.97 [44] and Spring (C) [45]. Then, pull out the Roll Pin
D3 x 32 [21] with the roll pin puller (3 mm dia.), remove the Pushing Lever Guide [48], and Trigger (C) [50]
can be removed.
Roll Pin D3 x 25 [20]
Roll Pin D3 x 32 [21]
Retaining Ring (E-type)
for D6 Shaft [22]
Body Ass'y [24]
Pushing Lever Guide [48]
Roll Pin D3 x 32 [21]
Fig. 15 Disassembly and reassembly of the control valve section
Carefully disassemble so as
not to lose these parts.
Steel Ball
D 3.97 [44]
Spring (C) [45]
Change Knob (C) [46]
Trigger Arm (C) [47]
Roll Pin D2.5 x 16 [49]
Trigger (C) [50]
--- 24 ---
Feed Piston O-Ring (I.D 14) [62]
Valve Bushing (B) [63]
O-ring (P-18) [64]
O-ring (P-7) [65]
Valve Piston [66]
O-ring (P-7) [65]
O-ring (1AP-10) [67]
Plunger Spring [68]
O-ring (I.D 1.8) [69]
Plunger [70]
O-ring (I.D 1.8) [69]
Valve Bushing (A) [71]