Camshaft
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| 图 1 | g00976240 |
检查凸轮轴的端隙 | |
(1) 新曲轴的轴向间隙 ... 0.10 至 0.41 mm (0.004 至 0.016 in)
磨损凸轮轴的最大允许轴向间隙 ... 0.53 mm (0.021 in)
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| 图 2 | g00976195 |
凸轮轴和止推垫圈 | |
(2) 螺栓
- 将螺栓拧紧至下述扭矩。 ... 95 N·m (70 lb ft)
(3) 凸轮轴止推垫圈
- 止推垫圈的厚度 ... 5.49 至 5.54 mm (0.216 至 0.218 in)
- 缸体上为止推垫圈预留的凹座的深度 ... 5.46 至 5.54 mm (0.215 至 0.218 in)
- 止推垫圈在缸体前表面的公差 ... −0.05 至 +0.08 mm (−0.002 至 +0.003 in)
(4) 下表列出了凸轮轴轴颈的直径。
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| 凸轮轴轴颈的直径 | ||
| 凸轮轴轴颈 | 标准直径 | 维修极限直径 (1) |
| 1 | 50.710 至 50.740 mm (1.9965 至 1.9975 in) |
50.660 mm (1.9945 in) |
| 2 | 50.460 至 50.480 mm (1.9865 至 1.9875 in) |
50.410 mm (1.9845 in) |
| 3 | 50.200 至 50.230 mm (1.9764 至 1.9775 in) |
50.150 mm (1.9745 in) |
| 4 | 49.950 至 49.980 mm (1.9665 至 1.9675 in) |
49.900 mm (1.9645 in) |
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| ( 1 ) | 维修极限是针对零件规定的最大或最小尺寸。 达到维修极限的零件必须更换。 |
轴颈的内部间隙 ... 0.06 至 0.14 mm (0.002 至 0.006 in)
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| 图 3 | g00629702 |
凸轮轴的截面图 | |
(5) 凸轮凸角升程
规定的凸轮凸角升程 (5)
- 进气凸轮 ... 7.62 至 7.69 mm (0.300 至 0.303 in)
- 排气凸轮 ... 7.71 至 7.79 mm (0.304 至 0.307 in)
(6) 凸轮凸角高度
(7) 基圆
利用以下程序确定凸轮升程：
- 测量凸轮凸角高度 (6) 。
- 测量基圆 (7) 。
- 将步骤 2 中得到的基圆数值从步骤 1 中得到的凸轮凸角高度中减去。 二者之差就是实际凸轮凸角升程。
新凸轮轴的实际凸轮升程和规定凸轮升程的最大允许差值 ... 0.05 mm (0.002 in)
Caterpillar Information System:
D3G, D4G and D5G Hystat Track-Type Tractors Engine Supplement Water Pump - Remove
3056 Engines Engine Oil Pump
621G and 623G Wheel Tractor Power Train Final Drive - Disassemble
966H and 972H Wheel Loaders Machine Systems Electrohydraulic Control - Remove
623G Wheel Tractor-Scraper Machine Systems Check Valve (Carry) - Disassemble
2001/10/29 Correction to Disassembly and Assembly , "Bucket-Install" {0645, 6101, 6102}
D10R Track-Type Tractor Power Train Chrome Bearing - Remove and Install
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D6N Track-Type Tractor Power Train Priority Valve
2001/11/12 A New Rear Housing Assembly is Available {1157}
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D3G, D4G and D5G Hystat Track-Type Tractors Engine Supplement Water Pump - Install
3056 Engines Cylinder Head
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621G and 623G Wheel Tractor Power Train Final Drive - Assemble
621G and 627G Wheel Tractor-Scrapers Machine Systems Air Tank - Remove and Install
D6R Series II Track-Type Tractor Power Train Bevel and Transfer Gears - Assemble
D3G, D4G and D5G Track-Type Tractors Piston Pump (Hydrostatic)
966H and 972H Wheel Loaders Machine Systems Electrohydraulic Control - Install
Installation of Automatic Lubrication for the 966G and the 972G Wheel Loaders{7540} Installation of Automatic Lubrication for the 966G and the 972G Wheel Loaders{7540}
3126B Engines for the IT62G Series II Integrated Toolcarrier and for the 950G Series II and 962G Series II Wheel Loaders Low Power/Poor or No Response to Throttle