别(Bie)拉(La)斯(Si)75485型(Xing)矿(Kuang)用(Yong)汽(Qi)车(Che)在(Zai)新(Xin)车(Che)走(Zou)合(He)运(Yun)行(Xing)中(Zhong)就(Jiu)连(Lian)续(Xu)出(Chu)现(Xian)好(Hao)几(Ji)期(Qi)转(Zhuan)向(Xiang)沉(Chen)重(Zhong),(?)甚(Shen)至(Zhi)打(Da)不(Bu)动(Dong)方(Fang)向(Xiang)盘(Pan)的(De)故(Gu)障(Zhang)。(?)而(?)按(An)原(Yuan)没(Mei)计(Ji)要(Yao)求(Qiu),(?)该(Gai)车(Che)型(Xing)采(Cai)用(Yong)的(De)是(Shi)全(Quan)液(Ye)压(Ya)转(Zhuan)向(Xiang)系(Xi)统(Tong),(?)其(Qi)方(Fang)向(Xiang)性(Xing)能(Neng)应(Ying)该(Gai)是(Shi)很(Hen)优(You)越(Yue)的(De)。(?)此(Ci)外(Wai),(?)该(Gai)车(Che)型(Xing)还(Huan)有(You)一(Yi)个(Ge)特(Te)点(Dian),(?)即(Ji)方(Fang)向(Xiang)系(Xi)统(Tong)与(Yu)举(Ju)升(Sheng)系(Xi)统(Tong)联(Lian)系(Xi)密(Mi)切(Qie)。(?)它(Ta)们(Men)共(Gong)用(Yong)一(Yi)个(Ge)油(You)箱(Xiang)和(He)同(Tong)一(Yi)种(Zhong)油(You)品(Pin),(?)由(You)三(San)个(Ge)齿(Chi)轮(Lun)泉(Quan)提(Ti)供(Gong)高(Gao)压(Ya)油(You)。(?)其(Qi)中(Zhong)二(?)个(Ge)泵(Beng)专(Zhuan)为(Wei)举(Ju)升(Sheng)系(Xi)统(Tong)供(Gong)油(You),(?)另(Ling)一(Yi)个(Ge)泵(Beng)则(Ze)具(Ju)有(You)双(Shuang)重(Zhong)功(Gong)能(Neng):行(Xing)驶(Shi)时(Shi)给(Gei)方(Fang)向(Xiang)系(Xi)统(Tong)供(Gong)油(You);举(Ju)升(Sheng)时(Shi)则(Ze)经(Jing)过(Guo)转(Zhuan)换(Huan)分(Fen)配(Pei)阀(Fa)给(Gei)举(Ju)升(Sheng)系(Xi)统(Tong)供(Gong)油(You)。(?)齿(Chi)轮(Lun)泵(Beng)通(Tong)过(Guo)虹(Hong)吸(Xi)管(Guan)向(Xiang)油(You)箱(Xiang)取(Qu)油(You)。(?)
上(Shang)述(Shu)故(Gu)障(Zhang)发(Fa)生(Sheng)后(Hou),(?)首(Shou)先(Xian)怀(Huai)疑(Yi)是(Shi)转(Zhuan)换(Huan)阀(Fa)发(Fa)卡(Ka),(?)工(Gong)作(Zuo)不(Bu)良(Liang)。(?)解(Jie)体(Ti)分(Fen)配(Pei)器(Qi)总(Zong)成(Cheng),(?)清(Qing)洗(Xi)后(Hou)检(Jian)验(Yan),(?)转(Zhuan)换(Huan)阀(Fa)配(Pei)合(He)副(Fu)并(Bing)无(Wu)拉(La)伤(Shang)发(Fa)卡(Ka)和(He)其(Qi)他(Ta)异(Yi)常(Chang)现(Xian)象(Xiang)口(Kou)随(Sui)后(Hou)怀(Huai)疑(Yi)举(Ju)升(Sheng)电(Dian)磁(Ci)阀(Fa)工(Gong)作(Zuo)不(Bu)良(Liang).产(Chan)生(Sheng)内(Nei)部(Bu)泄(Xie)漏(Lou),(?)方(Fang)向(Xiang)泵(Beng)油(You)量(Liang)流(Liu)失(Shi),(?)致(Zhi)使(Shi)进(Jin)入(Ru)方(Fang)向(Xiang)系(Xi)统(Tong)的(De)油(You)量(Liang)和(He)压(Ya)力(Li)不(Bu)够(Gou)。(?)但(Dan)经(Jing)检(Jian)验(Yan)属(Shu)正(Zheng)常(Chang)。(?)继(Ji)又(You)将(Jiang)方(Fang)向(Xiang)泵(Beng)出(Chu)油(You)管(Guan)不(Bu)经(Jing)转(Zhuan)换(Huan)阀(Fa)而(?)直(Zhi)接(Jie)与(Yu)方(Fang)向(Xiang)机(Ji)(转(Zhuan)向(Xiang)阀(Fa))连(Lian)接(Jie)供(Gong)油(You),(?)结(Jie)果(Guo)如(Ru)前(Qian)口(Kou)接(Jie)着(Zhuo)又(You)怀(Huai)疑(Yi)方(Fang)向(Xiang)泵(Beng)工(Gong)作(Zuo)不(Bu)良(Liang)。(?)更(Geng)换(Huan)新(Xin)泵(Beng)后(Hou)试(Shi)车(Che),(?)结(Jie)果(Guo)还(Huan)是(Shi)打(Da)不(Bu)动(Dong)方(Fang)向(Xiang)盘(Pan)。(?)最(Zui)后(Hou)将(Jiang)方(Fang)向(Xiang)泵(Beng)与(Yu)举(Ju)升(Sheng)泵(Beng)作(Zuo)功(Gong)能(Neng)转(Zhuan)换(Huan),(?)即(Ji)将(Jiang)一(Yi)个(Ge)举(Ju)升(Sheng)泵(Beng)为(Wei)方(Fang)向(Xiang)系(Xi)统(Tong)供(Gong)油(You)(方(Fang)向(Xiang)泵(Beng)与(Yu)举(Ju)升(Sheng)泵(Beng)结(Jie)构(Gou)、(?)性(Xing)能(Neng)参(Can)数(Shu)相(Xiang)同(Tong),(?)但(Dan)旋(Xuan)向(Xiang)不(Bu)同(Tong),(?)此(Ci)时(Shi)举(Ju)升(Sheng)泵(Beng)工(Gong)作(Zuo)正(Zheng)常(Chang)),(?)则(Ze)方(Fang)向(Xiang)性(Xing)能(Neng)非(Fei)常(Chang)良(Liang)好(Hao),(?)转(Zhuan)向(Xiang)轻(Qing)松(Song)白(Bai)·(?)如(Ru)。(?)至(Zhi)此(Ci),(?)即(Ji)可(Ke)诊(Zhen)断(Duan):问(Wen)题(Ti)出(Chu)在(Zai)方(Fang)向(Xiang)泵(Beng)的(De)进(Jin)油(You)管(Guan)路(Lu)至(Zhi)油(You)箱(Xiang)这(Zhe)一(Yi)段(Duan),(?)或(Huo)进(Jin)空(Kong)气(Qi),(?)或(Huo)油(You)道(Dao)堵(Du)塞(Sai)。(?)进(Jin)一(Yi)步(Bu)检(Jian)查(Cha),(?)排(Pai)除(Chu)油(You)道(Dao)进(Jin)空(Kong)气(Qi)因(Yin)素(Su)后(Hou),(?)即(Ji)可(Ke)确(Que)诊(Zhen)为(Wei)吸(Xi)油(You)管(Guan)路(Lu)堵(Du)塞(Sai)。(?)
该(Gai)车(Che)型(Xing)的(De)方(Fang)向(Xiang)举(Ju)升(Sheng)泵(Beng)的(De)吸(Xi)油(You)管(Guan)及(Ji)油(You)箱(Xiang)结(Jie)构(Gou)有(You)如(Ru)下(Xia)特(Te)点(Dian),(?)如(Ru)图(Tu)3-15.首(Shou)先(Xian),(?)采(Cai)用(Yong)虹(Hong)吸(Xi)管(Guan)吸(Xi)油(You),(?)虽(Sui)然(Ran)能(Neng)在(Zai)检(Jian)修(Xiu)油(You)路(Lu)故(Gu)障(Zhang)时(Shi)不(Bu)需(Xu)要(Yao)放(Fang)油(You),(?)液(Ye)压(Ya)维(Wei)修(Xiu)减(Jian)轻(Qing)了(Liao)检(Jian)修(Xiu)作(Zuo)业(Ye)的(De)负(Fu)担(Dan),(?)但(Dan)也(Ye)存(Cun)在(Zai)一(Yi)大(Da)缺(Que)陷(Xian)。(?)因(Yin)虹(Hong)吸(Xi)管(Guan)呈(Cheng)n形(Xing)且(Qie)吸(Xi)油(You)端(Duan)直(Zhi)抵(Di)油(You)箱(Xiang)的(De)底(Di)部(Bu)。(?)当(Dang)吸(Xi)油(You)时(Shi),(?)强(Qiang)大(Da)的(De)吸(Xi)力(Li)很(Hen)容(Rong)易(Yi)将(Jiang)油(You)箱(Xiang)底(Di)部(Bu)淤(Yu)积(Ji)的(De)脏(Zang)物(Wu)杂(Za)质(Zhi)吸(Xi)进(Jin)油(You)道(Dao)产(Chan)生(Sheng)堵(Du)塞(Sai)。(?)该(Gai)油(You)箱(Xiang)采(Cai)用(Yong)回(Hui)油(You)滤(Lu)清(Qing)方(Fang)式(Shi),(?)吸(Xi)油(You)口(Kou)处(Chu)的(De)滤(Lu)清(Qing)得(De)不(Bu)到(Dao)保(Bao)证(Zheng)。(?)其(Qi)次(Ci),(?)该(Gai)油(You)箱(Xiang)的(De)底(Di)部(Bu)为(Wei)平(Ping)面(Mian)形(Xing)结(Jie)构(Gou),(?)液(Ye)压(Ya)维(Wei)修(Xiu)而(?)非(Fei)锥(Zhui)形(Xing)斗(Dou)状(Zhuang)结(Jie)构(Gou),(?)淤(Yu)积(Ji)在(Zai)底(Di)平(Ping)面(Mian)各(Ge)处(Chu)的(De)杂(Za)质(Zhi)即(Ji)便(Bian)在(Zai)放(Fang)油(You)后(Hou)也(Ye)不(Bu)易(Yi)排(Pai)除(Chu)干(Gan)净(Jing)。(?)最(Zui)后(Hou),(?)该(Gai)油(You)箱(Xiang)为(Wei)密(Mi)闭(Bi)式(Shi),(?)四(Si)周(Zhou)都(Du)是(Shi)焊(Han)死(Si)的(De),(?)包(Bao)括(Kuo)吸(Xi)油(You)管(Guan)与(Yu)油(You)箱(Xiang)壳(Ke)的(De)连(Lian)接(Jie)也(Ye)是(Shi)焊(Han)接(Jie)牢(Lao)的(De),(?)故(Gu)当(Dang)油(You)箱(Xiang)内(Nei)吸(Xi)油(You)管(Guan)被(Bei)堵(Du)塞(Sai)时(Shi)一(Yi)也(Ye)不(Bu)容(Rong)易(Yi)得(De)到(Dao)及(Ji)时(Shi)检(Jian)查(Cha)和(He)彻(Che)底(Di)清(Qing)洗(Xi)。(?)为(Wei)此(Ci),(?)有(You)必(Bi)要(Yao)对(Dui)该(Gai)部(Bu)结(Jie)构(Gou)作(Zuo)局(Ju)部(Bu)改(Gai)进(Jin)。(?)
改(Gai)进(Jin)后(Hou)的(De)结(Jie)构(Gou)如(Ru)图(Tu)3-16,(?)将(Jiang)虹(Hong)吸(Xi)管(Guan)结(Jie)构(Gou)废(Fei)除(Chu),(?)吸(Xi)油(You)管(Guan)改(Gai)为(Wei)直(Zhi)吸(Xi)式(Shi),(?)且(Qie)吸(Xi)口(Kou)朝(Chao)上(Shang),(?)距(Ju)油(You)箱(Xiang)底(Di)平(Ping)面(Mian)有(You)一(Yi)定(Ding)的(De)距(Ju)离(Li),(?)这(Zhe)样(Yang)可(Ke)以(Yi)有(You)效(Xiao)地(Di)防(Fang)止(Zhi)脏(Zang)物(Wu)杂(Za)质(Zhi)进(Jin)入(Ru)吸(Xi)油(You)管(Guan)。(?)同(Tong)时(Shi),(?)在(Zai)吸(Xi)油(You)管(Guan)中(Zhong)上(Shang)部(Bu)的(De)两(Liang)侧(Ce)钻(Zuan)有(You)小(Xiao)孔(Kong)以(Yi)补(Bu)偿(Chang)吸(Xi)油(You)。(?)另(Ling)在(Zai)吸(Xi)i`E}管(Guan)的(De)出(Chu)口(Kou)外(Wai)接(Jie)一(Yi)手(Shou)动(Dong)阀(Fa)门(Men),(?)当(Dang)需(Xu)要(Yao)检(Jian)修(Xiu)该(Gai)系(Xi)统(Tong)故(Gu)漳(Zhang)时(Shi),(?)可(Ke)将(Jiang)阀(Fa)门(Men)关(Guan)闭(Bi),(?)即(Ji)可(Ke)取(Qu)得(De)虹(Hong)吸(Xi)管(Guan)的(De)便(Bian)利(Li)功(Gong)效(Xiao)。(?)同(Tong)时(Shi),(?)又(You)避(Bi)免(Mian)了(Liao)虹(Hong)吸(Xi)管(Guan)带(Dai)来(Lai)的(De)缺(Que)陷(Xian)。(?)
改(Gai)进(Jin)后(Hou)的(De)车(Che)辆(Liang)运(Yun)行(Xing)效(Xiao)果(Guo)表(Biao)明(Ming),(?)这(Zhe)一(Yi)措(Cuo)拖(Tuo)是(Shi)行(Xing)之(Zhi)有(You)效(Xiao)的(De)。(?)举(Ju)升(Sheng)系(Xi)统(Tong)的(De)进(Jin)油(You)管(Guan)路(Lu)与(Yu)方(Fang)向(Xiang)系(Xi)统(Tong)相(Xiang)同(Tong),(?)且(Qie)存(Cun)在(Zai)类(Lei)似(Si)的(De)故(Gu)障(Zhang).故(Gu)也(Ye)有(You)必(Bi)要(Yao)对(Dui)其(Qi)作(Zuo)类(Lei)似(Si)的(De)结(Jie)构(Gou)改(Gai)进(Jin)。(?)
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