Piston Motor (Propel)
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| 图 1 | g01266737 |
左前轮视图 (1) 马达 (2) 箱体排油口 (3) 端口 "A" (4) 端口 "M3" (5) 端口 "B" | |
每个前轮和后轮都配有推进马达。 除排量外，前后推进马达均相同。 字母数字字符铸入推进马达的壳体中，以便识别端口。
右前推进马达 (1) 如上图所示。 左侧马达相同，但左侧马达还配有转速传感器。 推进马达是一个活塞式弯轴马达。
箱体排放口 (2) 可使箱体排油流至油箱。 所有马达（左前马达除外）上的端口 "A" (3) 均为倒退端口。 所有马达（左前马达除外）上的端口 "B" (5) 均为前进端口。 左前推进马达上的端口 "A" 为前进端口，端口 "B" 为倒退端口。 端口 "M3" (4) 与辅助阀连接。 连接端口 "M3" 的管路中含有一个节流孔。 流入端口 "M3" 的机油迫使伺服活塞达到高速位置。
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| 图 2 | g01266741 |
推进马达横截面 | |
推进马达以两档速度运行。 前辅助歧管上的换档电磁阀决定了马达的速度档位。 当换档电磁阀断电时，马达将以低速运转。
高压回路中来自推进泵的供油进入缸体内的活塞腔。 泵供油迫使活塞移出活塞室。 该移动会导致缸体旋转。 同步轴将缸体的旋转传输到马达输出轴。 输出轴将动力传送至终传动组件。
反馈连杆与伺服活塞的中心连接。 当伺服活塞向下移动时，反馈连杆也会向下移动。 由于反馈连杆的一端与阀段相连，因此在伺服活塞和反馈连杆向下移动时，阀段也会向下移动。 伺服活塞和阀段持续移动，直至伺服活塞接触到最大排量限制器。 当伺服活塞接触最大排量限制器时，马达处于最大排量位置。 在此排量位置，马达以低速运转并产生最大扭矩。
高压回路中的机油作用于冲洗滑阀的一侧，而低压回路中的机油作用于冲洗滑阀的另一侧。 高压机油导致滑阀移动。 该移动会为低压回路中的机油开启油道，使其流向冲洗安全阀。 冲洗安全阀打开，低压回路内的机油流向箱体排放口。
Caterpillar Information System:
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0681 - FMI 03
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0600 - FMI 04
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0600 - FMI 03
938H and IT38H Wheel Loader and Integrated Tool Carrier Power Train Temperature Sensor (Transmission Oil)
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0490 - FMI 04
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0490 - FMI 03
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0358 - FMI 06
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0358 - FMI 05
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0358 - FMI 03
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0357 - FMI 13
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0357 - FMI 06
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0357 - FMI 05
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0681 - FMI 05
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 0681 - FMI 06
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 1007 - FMI 02
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 1007 - FMI 03
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 1007 - FMI 04
120M and 12M Motor Graders Hydraulic System Oil Level - Check
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 1190 - FMI 04
RM-500 Road Reclaimer/Soil Stabilizer Power Train Flow Divider Valve
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 1703 - FMI 03
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 1703 - FMI 05
RM-500 Road Reclaimer/Soil Stabilizer Machine Systems Steering Wheel - Remove and Install
279C, 279C2, 289C, 289C2 and 299C Compact Track Loaders, 287C, 277C, 277C2, 287C2 and 297C Multi Terrain Loaders and 246C, 256C, 262C, 262C2 and 272C Skid Steer Loaders Machine Electronic Control System MID 039 - CID 1703 - FMI 06