Hitachi CS 33EDP Service Manual page 17

6. Disassembly and reassembly of the oil pump
[Tools required]
• Phillips screwdriver
• Flat-blade screwdriver (for precision machinery)
• Long-nose pliers
(1) Disassembly
Disassemble the oil pump after disassembling the Clutch [30].
• Remove the two Tapping Screws (W/Flange) D4 x 16 (Black) [140], and then remove the Engine
Case Cover [157].
• Remove the two Tapping Screws (W/Flange) D4 x 16 (Black) [1], and then remove the Oil Pump
Cover [35].
• Remove the Pipe Joint [50] and Oil Pipe [49].
• Remove the Oil Pipe [49] from the Engine Case Ass'y [51] by pinching its tip (on the oil discharge
side) with long-nose pliers.
• Remove the Tapping Screw (W/Flange) D4 x 20 (Black) [36] that secures the Pump Ass'y [47], pull
out the Air Vent Sponge [48], and then remove the Pump Ass'y [47].
• For the Pump Ass'y [47], remove the two Needle Rollers 2.5 x 19.8 [37] and then remove the Pump
Gear (ED) [44] and Pump Gear Spring (ED) [45] in the Pump Case [46].
• Insert a flat-blade screwdriver (for precision machinery) to remove Air Vent Valve (B) [172].
(2) Reassembly
Reassembly can be conducted by reversing the disassembly procedure. However, special attention
should be given to the following items.
• If the Oil Pipe [49] or Air Vent Valve (B) [172] becomes worn or has flaws, replace it with a new one.
• If the Pump Gear (ED) [44] becomes worn, replace it with a new one.
• Remove any dust inside the Pump Case [46] or Pump Gear (ED) [44].
• Remove any dust inside the Oil Pump Cover [35].
• Apply 0.5 to 1.0 gram of Shell Albania RL3 to the Pump Gear (ED) [44], and then insert the gear into
the Pump Case [46].
• Engage the Pump Ass'y [47] with the worm on the crank shaft.
• Insert the Pump Gear Spring (ED) [45], Pump Gear (ED) [44],
and Adjuster Cap [42] into the Pump Case [46], and then insert
the two Needle Rollers 2.5 x 19.8 [37] while slightly pushing the
Pump Gear (ED) [44].
• Before assembling the Oil Pipe [49], confirm that there is no
dust on the insertion location of the Pump Case [46], and apply
0.2 to 0.4 gram of chain oil inside the Oil Pipe [49]. Then mount
the Oil Pipe [49] so that its holes match those of the Pump Case
[46].
• Note that you must not lose the Air Vent Sponge [48] and Air Vent Valve (B) [172].
• Pump gear (2)
A - A
0
0.2
-0.4
Needle Roller 2.5 x 19.8 [37]
Pump Case [46]
A
A
Sealing grease (0.2 g)
Adjuster Cap [42]
-16-
• Pump gear (1)
Application range of
Shell Albania RL3
(0.5 to 1.0 gram)
Pump Gear (ED) [44]
Pump Gear (ED) [44]
Pump Gear Spring (ED) [45]
B
B
Needle Roller 2.5 x 19.8 [37]
Do not apply grease
to this range
.
+4
5.8
0
+5
8.8
0
B - B
0
0.2
-0.4