345D, 349D and 349D2 Excavator Machine System Specifications Caterpillar


Pilot Valve - Boom Down Relief

Usage:

345D L BYC



图 1g01488096

注: 在要密封的螺塞组件 (1) 上稍涂润滑剂。

(1) 螺塞组件的扭矩 ... 44 ± 5 N·m (32 ± 4 lb ft)

(2) 17 个螺塞组件的扭矩 ... 16.0 ± 1.5 N·m (12 ± 1 lb ft)

(3) 安全阀总成的扭矩 ... 82 ± 7 N·m (60 ± 5 lb ft)

(4) 螺母的扭矩 ... 24.4 ± 2.7 N·m (18 ± 2 lb ft)

(5) 两条螺栓的扭矩 ... 7 ± 1 N·m (60 ± 9 lb in)

(6) 螺母的扭矩 ... 7.4 ± 0.5 N·m (65 ± 4 lb in)




图 2g01488113

(7) 螺塞扭矩 ... 345 ± 30 N·m (250 ± 22 lb ft)

(8) 在要密封的 2 个支承环孔上稍涂润滑剂。

(9) 在要密封的 3 个 O 形密封圈孔上稍涂润滑剂。

(10) 297-0350 弹簧

在试验力下的长度 ... 47.000 mm (1.8504 in)
试验力 ... 40.195 ± 2.010 N (9.0 ± 0.5 lb)
试验后的自由长度 ... 53.300 mm (2.0984 in)
外径 ... 18.000 mm (0.7087 in)

(11) 螺母的扭矩 ... 4.0 ± 0.5 N·m (35 ± 4 lb in)

(12) 螺塞的扭矩 ... 48 ± 5 N·m (35 ± 4 lb ft)

(13) 底座的扭矩 ... 2.25 ± 0.25 N·m (20 ± 2 lb in)




图 3g01488114

剖面 C-C

(14) 297-0354 弹簧

在试验力下的长度 ... 80.500 mm (3.1693 in)
试验力 ... 27.222 ± 1.361 N (6.1 ± 0.3 lb)
试验后的自由长度 ... 105.500 mm (4.1535 in)
外径 ... 22.000 mm (0.8661 in)



图 4g01515883

截面 D-D

(15) 297-0348 弹簧

在试验力下的长度 ... 68.000 mm (2.6772 in)
试验力 ... 423.360 ± 21.168 N (95.2 ± 4.8 lb)
试验后的自由长度 ... 74.300 mm (2.9252 in)
外径 ... 36.000 mm (1.4173 in)

(16) 297-0347 弹簧

在试验力下的长度 ... 24.000 mm (0.9449 in)
试验力 ... 184.162 ± 9.208 N (41.4 ± 2.1 lb)
试验后的自由长度 ... 38.500 mm (1.5157 in)
外径 ... 28.000 mm (1.1024 in)

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