• 2019

Keeping the Fluid Flowing

The Repair Guide to Transmission Pumps in a 62TE Automatic 6-Speed

Introduced in 2008, this transmission has been used in minivan models, the JS body style (Chrysler 200) and the JC body (Journey).

 

The 62TE is an automatic transmission, or more correctly, a transaxle, with a planetary gear train that provides six forward gears, including two fourth gear ratios. One reverse gear ratio is also provided.

The 62TE is identified by a barcode label that is affixed to the transaxle or the PK number. The label contains a series if digits that can be translated into useful information, such as transaxle part number, date of manufacture, manufacturing origin, etc. If the tag is not legible, or missing, the PK number can be used for identification. It is stamped into the transaxle case behind the transfer gear cover.

If a problem occurs with the operation of the transaxle, a road test should be performed to pinpoint the problem. Prior to performing such a test, verify that the fluid level, fluid condition and linkage adjustment have been approved. During the road test, the transaxle should be operated in each position to ensure no slipping or any variation in shifting.

If the vehicle operates properly at highway speeds, but has poor acceleration, the converter stator overrunning clutch may be slipping. If acceleration is normal, but high throttle opening is needed to maintain highway speeds, the converter stator clutch may have seized. Both of these stator defects require replacement of the torque converter and a thorough transaxle cleaning.

Slipping clutches can be isolated by comparing the clutch application chart with clutch operation encountered on a road test. This chart identifies which clutches are applied at each position of the selector lever. A slipping clutch may also set a DTC and can be determined by operating the transaxle in all selector positions. The clutch application chart can be located in the appropriate service manual for the vehicle being tested.

Process of elimination can be used to detect any unit which slips and to confirm proper operation of good units. Road test analysis can diagnose slipping units, but the cause of the malfunction cannot be determined by a road test. Practically any condition can be caused by leaking hydraulic circuits or sticking valves. In most cases, the transaxle must be removed and disassembled to determine the problem and its cause.

Figure 1. 62TE Pump Parts

Transmission Pump Issues

When issues occur with the transaxle, the oil pump can often be the cause. In particular, if the transaxle experiences weak or slow engagement of gears, or if the vehicle slowly moves forward, the pump might very well be the cause. In addition to the performance characteristics, a bad pump will make a whining sound that is very similar to a worn power steering pump, or such a pump having a low fluid level.

The oil pump is located in the pump housing inside the bell housing of the transaxle case. The oil pump consists of inner and outer gears (2), a housing, or body (1), and a cover that also serves as the reaction shaft support (3) (see Figure 1).

As the torque converter rotates, the converter hub rotates the inner and outer gears. As the gears rotate, the clearance between the gear teeth increases in the crescent area and creates suction at the inlet side of the pump. This suction draws fluid through the pump inlet from the oil pan. As the clearance between the gear teeth in the crescent area decreases, it forces pressurized fluid into the pump outlet and into the valve body. If the gear teeth experience excessive wear, the pumping action is negatively affected, resulting in transaxle performance problems.

Let’s examine the procedure for checking the oil pump and measuring pump gear teeth clearances. This inspection procedure will determine if the oil pump will require replacement.

Figure 2. Oil Pump Gears

Checking the Oil Pump

In order to check the oil pump, the transaxle must be removed from the vehicle. Our subject vehicle for this article is a 2009 Dodge Caravan. (Check the appropriate service manual for the vehicle you’re servicing.)

Remove/disconnect the following ancillary components before removing the transaxle: (1) the vacuum pump, (2) transmission cooler lines, (3) shift cable, (4) input speed sensor wire and (5) transmission wire harness connector. Next, remove the left engine mount, then detach the wiring harness retainer. Remove the upper bell housing bolt and stud, then both half shafts and all of the splash shields.

Support the engine and transmission, then remove the front and rear engine mounts. Next, remove the three starter bolts, position the starter aside and remove the rear lower engine-to-transmission bolt. Detach the wiring harness push pin, remove the torque converter dust shield, then remove the torque converter driveplate bolts. Support the transmission with a suitable jack and remove it from the vehicle.

Once the transaxle is out of the vehicle and on the work bench, remove the six reaction shaft-to-pump body bolts. Then, remove the reaction shaft support (3) from the pump body (1). Remove the pump gears (2) (refer to Figure 1). Check for wear and damage on the pump gears and pump body. Re-install the gears.

Refer to Figure 2 and measure the clearance with a feeler gauge between the following components in this order (the specs are shown in parentheses): (1) outer gear and pump body (0.0026” -0.0043”), (2) outer gear and crescent (0.0032” – 0.0057”) and (3) inner gear and crescent (0.0048” – 0.0073”). Excessive clearance for any of the measurements indicates the oil pump assembly should be replaced.

Next, place a piece of Plastigage across both gears. Align the Plastigage with a flat area on the reaction shaft support housing (3 in Figure 1). Install the reaction shaft into the pump housing, then tighten the bolts to 20 ft.-lbs. Remove the bolts and carefully separate the reaction shaft from the pump housing.

Measure the Plastigage using the instructions provided (the width measurement of the Plastigage corresponds to a particular clearance measurement). The clearance should be in the range of 0.0008” – 0.002”. If the clearance is out of this range of values, replace the oil pump assembly.

Installing the New Oil Pump

Before the new pump is installed, it must be assembled (refer to Figure 1). Insert the outer and inner gears (2) into the pump housing (1). Be sure that the dimples on the gear surfaces are facing up. Install the reaction shaft support (3). Install the six reaction shaft-to-pump body bolts into the pump housing, then tighten the bolts to 20 ft.-lbs.

To complete the job, install the transaxle back into the vehicle. The installation procedure is the removal procedure performed in the opposite order. Finally, fill the transaxle with the correct amount of the proper transmission fluid.