6. Fuel injection equipment
138
(2) Fuel adjustment for 3YM20
1) Loosen the nut of the FO limiter, and screw the
adjusting bolt to the bottom. Tighten the nut.
2) Adjust the rack position to R0 (15mm) with the FO
limiter, and measure the injection volume (A) at
the rated speed.
3) When the measured injection volume (A) is out of
the standard, readjust the injection volume by
screwing the FO limiter.
4) Pull the control lever to high idle side at full rack
position.
5) Adjust the position of the high idle set bolt at high
idle speed as to get the specified injection volume
(B).
6) Loosen the nut of the FO limiter, and loosen the
adjusting bolt at 180
°
. Fix the nut.
7) Screw the angleichi at the torque-rise speed to get
the specified injection volume (C).
8) Confirm the injection volume (D) at the specified
speed at starting.
9) Push the control lever to low idle side.
10) Adjust the position of the low idle set bolt at low
idle speed as to get the specified injection volume
(E).
Pump seed N (min
-1
)
Rs
19 0.5
R
0
15
Rack position (mm)
(D)
(C)
(E)
(A)
(B)
(Adjustment procedure for item 1) and 6))
2. Loosen adjusting bolt
3YM30 : 360
3YM20 : 180
1. Loosen nut
3. Tighten nut
(Adjustment procedure for 5) and 10))
High idle set bolt
Low idle set bolt
(Adjustment procedure for 7))
1. Loosen nut
3. Tighten nut
2. Screw angleich.
Adjust injection volume to (C) by screwing.
