重慶手動叉車小編就來聊聊內燃叉車制動系統為油壓蹄片式前輪制動，踏下制動踏板，制動總泵輸出低壓制動液，一路進人變速器操縱閥，切斷通向離合器的壓力油路;另一路進人真空增壓器，增壓后進人車輪制動器中的制動分泵，漲開制動蹄片實現車輪制動。若叉車制動系統動力不足，可能是機械部分、或油路系統或真空增壓系統有故障。

1、機械部(bu)分

(1)制(zhi)動(dong)蹄片和制(zhi)動(dong)鼓的間隙調整不當(dang)或(huo)制(zhi)動(dong)蹄片磨損嚴重;應調整或(huo)更換。

(2)制(zhi)動(dong)(dong)鼓尺寸(cun)超(chao)限，造成(cheng)分泵(beng)行程過大，制(zhi)動(dong)(dong)時總泵(beng)排出的制(zhi)動(dong)(dong)液不(bu)足以推開兩(liang)制(zhi)動(dong)(dong)分泵(beng)(制(zhi)動(dong)(dong)鼓的標準尺寸(cun)為∮420mm，如超(chao)過∮426mm則應更換(huan))。

(3)制(zhi)動(dong)(dong)(dong)蹄(ti)片(pian)的(de)曲率半徑小(xiao)于制(zhi)動(dong)(dong)(dong)鼓(gu)的(de)半徑(正(zheng)常情(qing)況下(xia)應(ying)大(da)0.5mm左右)，造成制(zhi)動(dong)(dong)(dong)蹄(ti)片(pian)“吃中間”，使制(zhi)動(dong)(dong)(dong)蹄(ti)片(pian)和制(zhi)動(dong)(dong)(dong)鼓(gu)制(zhi)動(dong)(dong)(dong)時接(jie)觸面積達不(bu)到要求。

(4)輪(lun)鼓內油(you)封和制動(dong)(dong)分泵漏油(you)，導(dao)致制動(dong)(dong)鼓和制動(dong)(dong)蹄片有油(you)污，使(shi)制動(dong)(dong)摩擦系數下降;應更(geng)換油(you)封，清洗制動(dong)(dong)鼓和制動(dong)(dong)蹄片。

(5)制動踏(ta)板的(de)自由行(xing)程過大;應調整。

2、油路系統

(l)液壓叉(cha)車制動系統中(zhong)有空氣或接(jie)頭(tou)漏(lou)油;應(ying)排除系統中(zhong)的空氣或換(huan)修漏(lou)油的接(jie)頭(tou)。

(2)制動總泵(beng)、分泵(beng)、真空增壓(ya)器(qi)增壓(ya)缸(gang)(輔助(zhu)缸(gang))和變(bian)速器(qi)切斷閥的(de)密(mi)封(feng)(feng)性能(neng)差，制動時不能(neng)保壓(ya)，有泄油或(huo)返油現象;應更換其密(mi)封(feng)(feng)件。

3、真空增壓系統(tong)

(1)真(zhen)空增壓器增壓不足是真(zhen)空增壓系統常見的故障。

叉(cha)車廠家在60-Ⅱ型真空(kong)(kong)(kong)(kong)增壓器由增壓缸(輔(fu)助缸)、控(kong)制室(shi)、真空(kong)(kong)(kong)(kong)加力(li)(li)氣(qi)室(shi)(動(dong)力(li)(li)缸)三者構(gou)成(cheng)(cheng)。控(kong)制閥(fa)內部(bu)由膜片(pian)分離(li)成(cheng)(cheng)左右兩腔(qiang)。真空(kong)(kong)(kong)(kong)閥(fa)與(yu)(yu)空(kong)(kong)(kong)(kong)氣(qi)閥(fa)是一(yi)體，依靠彈簧(huang)作(zuo)用。在叉(cha)車未制動(dong)時(shi)，真空(kong)(kong)(kong)(kong)閥(fa)與(yu)(yu)膜片(pian)座中心孔之間(jian)保持(chi)(chi)常開狀態，而空(kong)(kong)(kong)(kong)氣(qi)閥(fa)保持(chi)(chi)常閉的狀態。動(dong)力(li)(li)缸由皮膜分成(cheng)(cheng)前、后(hou)腔(qiang)，前腔(qiang)與(yu)(yu)真空(kong)(kong)(kong)(kong)罐相(xiang)連，真空(kong)(kong)(kong)(kong)罐通過管(guan)子與(yu)(yu)真空(kong)(kong)(kong)(kong)泵相(xiang)連;后(hou)腔(qiang)通過管(guan)子與(yu)(yu)控(kong)制閥(fa)右腔(qiang)相(xiang)連。