5L40E/5L50-E: Isolating Concerns Re: Loss of Reverse or TCC

图1shows a5L40-E阀体在阀体机上进行测试。这里使用的压力低于正常的操作压力，但是使得可以捕获从阀体爆发的许多喷射和喷泉。实际上在正常操作下，这些喷射将是加压喷雾。现代阀体中有许多排气点，即使在最好的情况下，这种飞行流体陷阱并带有相当数量的空气，并在其前往油底壳的路上。这是预期的;弹油和皮卡旨在处理一定的曝气量。

当阀门和孔开始穿,让窃取的e, the easiest path for the leak is to exhaust. Two things happen as a result of this wear-induced exhaust leak. First, the leak allows a pressure drop which is loss of control pressure. Valves or components no longer move, apply or respond as intended. Second, the amount of exhausted fluid and therefore the amount of air entering the sump is increased. The amount of aeration can easily surpass the sump's ability to dissipate the air before the pump picks it up. The minimal sump capacity of the 5L40-E makes it especially vulnerable to this problem.

下图确定了与磨损和泄漏产生的两个带有两个人的疾病相关的反向或TCC投诉。插图和注意事项遵循服务顺序，从车载开头，拆卸，台式检查和结束，以便测力计或车辆测试的准备。

图2.
申诉	Cause	Isolation
TCC滑倒code Converter lining & fluid overheat TCC piston deflection	TCC调节器孔 AFL Bore 主要调节器孔 TCC solenoid quality 泵交叉泄漏	Wet air test Vacuum testing TCC信号上的压力表
高压下逆转	Reverse lock-out bore Wear valve body cross leaks	Wet air test Vacuum testing TCC信号上的压力表
Loss of reverse at low pressure	有缺陷的TCC螺线管 反向锁定阀陷入困境	隔离电磁阀
损失为4-5 错误的齿轮开始 TCC滑倒 反向高压 离合器窘迫	AFL bore wear 主要调节器孔	Wet air test 压力表在线水龙头。检查最大反向压力。 Vacuum testing

通过拆下油底壳和手动阀的反向位置，将30至40psi的调节空气涂在主线压力龙头中。这被称为捕获的湿空气测试或Wat。水龙头位于泛导轨和冷却器线之间。良好的阀体在指示的三个位置处具有最小的液体损失（图3.）。

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低压下逆转

由于滤波器，过滤器是常见的，因为由于与阀门接触而最终打破。过滤器片段迁移到反向锁定孔，并导致阀门朝向保持器（图4.）。

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高压下逆转

Cross leakage into the TCC signal circuit can partially stroke the reverse lock-out and TCC enable valves. Cross leaks may occur at the pump surface, TCC solenoid, TCC regulator bore, a warped valve body surface or the reverse lock-out valve. When TCC signal circuit pressure reaches 5-7 psi, the reverse lock-out valve will have moved enough to restrict reverse. At 10-12 psi the TCC control and enable valves are positioned to restrict converter release oil flow.

可以为测试工具修改使用的TCC电磁阀，或者可以制成夹具以复制OE歧管。要使用螺线管，请卸下线圈和两个屏幕，然后插上具有包装屏幕的端口。如果您可以制作自己的测试歧管，请制作在TCC阀门出口的通孔，然后敲击外端以进行可拆卸插头。该工具可用于功能单元，因此可移动的结束插头允许您验证压力积累。

Using the test tool on a bench unit, apply low air pressure to the outer end. Air flow should only exit at the TCC regulator valve and into the TCC signal circuit.

During the air test, the TCC enable valves (located in the pump) and reverse lock-out should stroke and no leakage should be visible at the TCC regulator bore. If the reverse lock-out valve does not stroke, filter particles may be causing it to stick.

If you use the tool during a vehicle reverse pressure test, it can isolate valve body vs. pump issues. Install your test manifold, with the removable plug in the through hole. If reverse remains engaged at high pressure, the original TCC solenoid had a cross leak. If reverse is still lost, the unit has a cross leak and circuits can be air tested through the tool to identify the source.

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Case Circuit Testing

显示的情况电路（见图5.）可以空气测试以识别泵交叉泄漏。两个电路都在阀门上死了。当它们在50-70psi下加压时，阀门应该中风，但是从任何其他区域都没有看到泄漏。如果它确实泄漏，有孔磨损或泵翘曲，导致TCC和离合器压力问题。

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阀体孔检查

图6.识别以前测试中被隔离的关注的阀门。清洁铸件后，这些区域可以真空测试，或者可以检查孔的磨损。阀门本身很少有任何证人标志。可以检测到钻孔，但它确实需要仔细检查。通过校准的真空测试站和阀门的适当阀门，这些电路应保持至少18英寸的真空。

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泵检查

一旦单位拆卸，检查TCC使能钻孔和主压力调节器孔（图7.）。主要调节器孔wear causes slide instability, pump/rotor damage, high pressure and TCC issues. Bore wear at the inner spool of the TCC enable valve causes overheated converters and high slip rates.

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Bell Housing Pressure Taps

如果您有重复的问题，或希望验证TCC电磁质量和控制，请在铃声上轻敲进入TCC电路（图8.) will be a productive test. Tapping into these circuits identifies the amount of pressure within the TCC apply and signal oil. These circuits can be drilled and accessed with the pump/bell removed. Accurate gauge or Transducer should be installed.

If you perform this, use the precautions of the construction trade, "measure twice and drill once." The casting material is minimal but sufficient to access the ports with a Parker# 169PL-4-10X32 fitting. If you have not utilized this nylon tubing test before, also purchase a 169PL-4-2 and sufficient nylon tubing.

Bob Warnke is Sonnax Vice President of Technical Development and a member of the SonnaxTascForce®.（技术汽车专业委员会），一批认可的行业技术专家，transmissionrebuilders and Sonnax Industries Inc. technicians.