Install Shimano revoshift. bike came with shift cable not attached. how do I attach it? thanks, barry lentz

I had a look at the Mongoose website.
They have manual for download.

https://int.mongoose.com/pages/product-manuals

Enter the model of your bike, or look for a picture of it.
Follow the instructions....

REgards
Geoff

A derailleur is a device that assists in shifting the gears and moving the chain from one chain ring to the next. This is generally achieved by the use of a cable and a shift lever that is attached to the handle bars.

I finished changing the cable of Shimano Deore XT SL-M740. Unfortunately it did not have the plastic screw hiding the chunk of lead at the end of the cable. I mean that there is no hole from which the cable can be pulled out. Therefore, I removed the front panel where you see "Simano Deore", but this panel only removed the shift position indicator and the internal mechanism was covered by another metal sheet. To change the cable I had to remove the small cover between the barrel adjuster and the lever. The cover is fastened by two very small screws. An encouraging sign was that one of these screws was missing. That indicated that a previous owner had removed the cover once. The cable end was attached to a component exactly like a brake cable is attached to a brake lever. This component pulls the cable around the shifter. The sift cable is not attached to the shift lever. The sift lever rotates the said component. The barrel adjuster had a slot to put the cable inside. Therefore, attaching the cable to the above component was easy. When the cover was installed, I attached the small screw to the end of a driver with silicon paste. Someone suggested to use grease, but grease is messy.

Try flushing out the shifter(s) with WD-40, use plenty. The next step will be replacing the shift cables and cable housings.

• Take the bicycle in an area free of cars and obstacles, such as an open parking lot. Concentration is required when learning to use Ultegra shifters or any other type of bicycle shifter.
  
• 2 Mount the bicycle and rest both hands on the proper Ultegra hand control. The left-hand control operates the front derailleur. The right-hand control operates the rear derailleur.
  
• 3 Start pedaling, smoothly and evenly. While pedaling is crucial to propelling the bicycle forward, it is also necessary when shifting the derailleur. Pedaling forces the chain to rotate. The chain must rotate before it can transfer to another gear.
  
• 4 Push the outside right Shimano Ultegra lever in toward the bicycle. The rear derailleur will shift the chain to a smaller rear gear.
  
• 5 Push the inside right Shimano Ultegra lever in toward the bicycle. The rear derailleur will shift the chain to a larger rear gear.
  

Rear Ultegra Derailleur Control

• 1 Push the outside left Shimano Ultegra lever in toward the bicycle. The front derailleur will shift the chain to larger front gear.
  
• 2 Push the inside left Shimano Ultegra lever in toward the bicycle. The front derailleur will shift the chain to a smaller front gear.
  
• 3 Use the front and rear Ultregra hand controls interchangeably. For small changes in gearing, using the rear control. For larger changes, choose the front control. A smaller gear causes the bicycle to travel a shorter distance per pedal stroke but also requires less energy to use. A larger gear requires greater effort but in turn causes the bicycle to travel farther per pedal stroke.
  

Adjustment.

Head over to http://www.parktool.com/blog/repair-help and click on deralllieur systems for procedures.

New bike? Or old one not maintained well?

http://www.ehow.com/how_7204949_use-shimano-sora.html

http://www.sheldonbrown.com/cables.html

The problem is not with the derailleur tension - that is preset. If the levers worked properly on your wife's bike you may have the cable set just a bit too tight, so that there is too much tension against the outer limit stop when you shift to the large chainwheel. Try backing off the high limit screw. If you can then shift down OK you need to loosen the cable clamp and let the cable slip very slightly looser (and then restore the proper outer limit adjustment). If there's still a problem then the only culprit is the lever.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

One of these should get you going...

http://techdocs.shimano.com/techdocs/index.jsp

http://techdocs.shimano.com/techdocs/blevel.jsp?FOLDER%3C%3Efolder_id=2534374302052334&ASSORTMENT%3C%3East_id=1408474395181679&bmUID=iS2s7KN lists a lot of Revo Shifters

http://techdocs.shimano.com/media/techdocs/content/cycle/SI/Nexus/ShiftLever/SB-7S45/SI-65R0C-001-ENG_v1_m56577569830630954.pdf

http://techdocs.shimano.com/media/techdocs/content/cycle/SI/Nexus/ShiftLever/SL3S41E_SMBC06/6NL0A-001_SL3S41E_SMBC06-EN_v1_m56577569830625399.pdf

http://www.parktool.com/blog/repair-help will describe some of the techniques and tools required (they sell tools).

Since you'll need to go to a bike shop to buy the right shifter and brake cables anyway you should have them show you some of the fine points and ask about the special tools (cable cutter, for example) required. You may find that unless you intend to become a regular self-service bicycle mechanic the cost of equipping for that is prohibitively expensive and the occasional paid repair or tune-up would be worthwhile. In fact, a tune-up would address your problem and others of which you may be unaware.

All available manuals are listed at www.shimano.com

I just had the same problem with my wife's old bike. After removing the cover (as explained in answer #2), I saw that the pawl (the part that engages the ratchet)was stuck in the open position because the grease had dried up. A shot of pbblaster (or WD40) freed it up and everything is now working fine.