Yuchai YC6A Series, Operation & Maintenance Manual

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Please pay attention to the following when using:
（
1
）检查油泵润滑油量是否充足，不足时应加足。
Check whether the lubricating oil in the pump is adequate. Fill full if inadequate.
（
2
）放完输油管道及油泵内腔空气。
Exhaust the air in the fuel transfer pipe and fuel pump.
（
3
）检查供油提前角是否正确，若不正确需调整。
Check whether the fuel supply advance angle is correct. Adjust it if incorrect.
（
4
）检查断油装置是否起作用，若不起作用需妥善修复。
Check whether the fuel cutoff device could work. If it can’t work, repair it.
静态时供油提前角参考技术参数表，提前角不符时应通过专业人员进行调整，这时可通过
对油泵联轴器（带提前器）的调整来实现。检查提前角时，松开第一缸高压油管与油泵的连接
螺母，慢慢转动曲轴，当出油阀紧帽中的油面开始波动时即停止转动曲轴，此时定时指针在皮
带轮减振器定时刻度上的指示值即为供油角度（图
2—16
）。在飞轮壳和飞轮上有指针和刻度，
请用户加以注意。
Refer to the technical parameter table for the fuel supply advance angle in static status.
Special staff shall adjust the advance angle if it doesn’t conform to the requirement. The
angle could be adjusted by adjusting the fuel pump coupling (with advance device). When
check the advance angle, release the connecting nut of the first cylinder high pressure fuel
pipe and fuel pump; rotate the crankshaft slowly, stop rotating the crankshaft when the oil
level of the fuel valve begins to fluctuate; the angle value on the belt pulley vibration absorber
timing scale is the fuel supply angle (Fig 2-16). The user shall pay attention to the pointer and
scale on the on the flywheel housing and flywheel.
供油提前角度调整：
Adjusting fuel supply advance angle:
方法
-
：适当松开喷油泵前端连接法兰的紧固螺母，然后把喷油泵按需要适当拔转一角度（喷
油泵往内拔转则提前角度变大，喷油泵往外拔转则提前角度变小），然后拧紧连接法兰的螺母，
检查供油提前角，调整至符合要求后把连接法兰紧固螺母拧紧。
Method 1: release the fixing nut connected to the flange at front of the fuel injection pump;
then rotate the fuel pump at an angle as required (the advance angle increase if the pump
rotates inwards while the angle decreases if rotating outwards.); tighten the nut connected to
the flange and check the fuel supply advance angle; tighten the nut after adjust it as required
方法二：打开喷油泵齿轮盖板，适当拧紧喷油泵齿轮的四个紧固螺栓，转动喷油泵齿轮轴
2
调整供油提前角（顺时针方向转动喷油泵凸轮轴，增大供油提前角，反之减小供油提前角），
然后扭紧喷油泵齿轮的固定螺栓，检查供油提前角，直至符合要求后按扭矩要求拧紧喷油泵齿
轮的四个紧固螺栓。
Method 2: open the gear cover of the fuel injection pump; tighten 4 tightening bolts of the
pump gear; rotate the pump gear shaft to adjust fuel supply advance angle (the fuel supply
advance angle increases when rotate the fuel injection pump camshaft clockwise, oppositely,
the angle decrease), tighten the fuel injection pump gear fixing bolts; check the fuel supply