How to Troubleshoot Your Transmission Jack - Transmission Digest

How to Troubleshoot Your Transmission Jack

Transmission jacks are powerful, multitask lifting systems that are essential in most repair shops. But like any equipment, they are most effective when properly maintained, regularly inspected for damage and used correctly.

Even the best-maintained transmission jacks occasionally give mechanics trouble. Knowing the potential issues and troubleshooting steps can minimize downtime and get you back to work quickly.

Many transmission jack issues are caused by low hydraulic fluid levels. If you have any of the following problems, start by checking the fluid level and topping off as needed:

  • Unit fails to extend or only partially extends.
  • Incomplete or spongy cylinder response when foot pedal is pumped.
  • Abnormal leakage through unit breather.

Note that air in the system can also cause a spongy cylinder response. Air can accumulate within the hydraulic system during shipment or after prolonged use. If the fluid level is correct, you may need to bleed the hydraulic system. Check your owner’s manual for the steps to follow. For Ranger products, pump the jack to the highest point where the first and second piston rams are both at maximum height. Get someone else to help you keep the release pedal pressed while you activate the foot pedal about 20 times. Then let go of the release pedal.

Contamination of the hydraulic system can cause the cylinder to fail to extend or to retract when the foot pedal is released. If this occurs, disassemble the jack and clean it. Remember to only use hydraulic jack oil. Do not use hydraulic brake fluid.

If the jack won’t extend when the foot pedal is pumped or it retracts on its own, the fluid is clean and adequate, flush the release valve by pumping the foot pedal with the valve open. There could also be a cylinder packing failure — this can be remedied by installing a new seal kit.

User error is also a common issue. If your cylinder is creeping when holding a load or won’t retract when the release pedal is activated, you may be trying to lift a load that is too heavy or too light for the equipment rating.

Source: BendPak

You May Also Like

Sonnax introduces Sure Cure Kit for GM 6L80, 6L90

Sonnax has introduced a Sure Cure kit for rebuilders of GM 6L80/6L90 transmissions. The company says this kit can restore shift quality and repair common TCC trouble areas, offering products to help rebuilders repair worn areas and protect the transmission against future damage. The kit is part no. SC-6L80-6L90.

Sonnax has introduced a Sure Cure kit for rebuilders of GM 6L80/6L90 transmissions. The company says this kit can restore shift quality and repair common TCC trouble areas, offering products to help rebuilders repair worn areas and protect the transmission against future damage. The kit is part no. SC-6L80-6L90.

The importance of the follow-up road test after transmission replacement

A 2002 Lexus RX300 equipped with a 3.0-liter V6 engine and U140F transmission was brought into our facility with a few concerns. The customer said that “it has a leak, a grinding noise when taking off from a stop, and it just doesn’t seem to shift right.” Related Articles – The torque converter can of

RR Tech Feature Oct
Dealing with the increasingly common pin-fit problem

I want to talk a little bit about a common diagnostic misstep or overlooked problem that is prevalent in the automotive repair industry and seems to be on the rise. Pin-fit or tension can deal us a fit sometimes (pun intended), especially if we do not have the proper tools to determine if this mode

RR-Tech-September-FIG-1-1400
Watch: Replacing a transmission and components

Dave Hritsko and the team have already removed a full transmission in a previous video. This time, see an in-depth explanation of the parts, components, and steps in how they make the upgrade with a remanufactured transmission along with new aftermarket components with the help of students from Ohio Technical College. Related Articles – Navigating

Removing-a-Transmission-with-Dave-from-Transtar-1400
Watch: How to remove a transmission

Watch Dave Hritsko from Transtar and team members from Ohio Technical College as they remove an old transmission and replace it with a newly remanufactured transmission. Related Articles – Can you jump-start an EV? – AMN Drivetime: Strategies for a changing aftermarket – Road to AAPEX season 2 finale: Where the road ends and the

Other Posts

BendPak announces upgraded Litestix work light

BendPak announced a new, upgraded version of its Litestix portable LED work light. The company says the new Litestix LS36SMDX model is now powered by a higher-capacity rechargeable battery and provides up to seven hours of continuous use on one charge. This represents another hour of performance over its predecessor, BendPak said. Related Articles –

BendPak founder Don Henthorn passes away

Don Henthorn, owner and founder of BendPak Inc., peacefully passed away at home Thursday, March 28, at the age of 85. Under his leadership, BendPak has grown from a small machine shop to one of the world’s leading manufacturers of car lifts and automotive service equipment. Related Articles – Report: U.S. automotive aftermarket industry grew 8.6% in

Don-Henthorn-BendPak_Passing-1400
BendPak introduces new full-rise scissor lifts

BendPak has introduced the new SP-7XE Series of full-rise scissor lifts. They are rated for a capacity of 7,000 lbs. and can raise most cars and light trucks nearly six feet. BendPak says these lifts are made for shops with space constraints. Related Articles – TransGo releases Allison valve body kit – Sonnax introduces oversized cooler/lube flow

BendPak to showcase eight-armed lift concept at NADA Expo; fall release planned

BendPak announced that its new Octa-Flex prototype lift will first be shown in booth 4569W at NADA Expo in Las Vegas, Feb. 2-4. The Octa-Flex is a two-post lift series with eight fully adjustable, telescoping lift arms. It features two sets of arms: triple-telescoping swing arms plus all-new integrated lift-assist arms Related Articles – Snap-on debuts new