Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Can I use this to grease the fittings on a semi tractor and trailer?
Document: I have had this 12V cordless grease gun for quite sometime now and it has saved me a great deal of time greasing my farm tractor and equipment. The kit comes with two batteries and I keep one on charge while using the other one. It works well for me and the seller provided good service.
I have to grease my truck and trailer every two weeks. I have used it twice now and it has lived up to expectations. It was hard to pull off the fitting's but I suppose that will change as the tip is worn (the spring on the end for gripping came off the first time I used it). One area that I am not sure about is how to tell if grease is going in the fitting.
got this for my husband,he uses it to grease tractor and he is well pleased,said it makes the job much easier
One of the thing I have to make sure of is that a part is getting grease in order to prevent a failure.
I finally ended up cutting this nozzle fitting from the grease fitting.I replaced the fitting that was supplied with this grease gun with one that I had laying around and now this grease gun works great.
This unit  is quite heavy and bulky but not really a problem.I would have given this grease gun 5 stars except for my one problem.When I started using this grease gun, the tip that connects to the grease fitting was VERY hard to remove from the fitting.
item was very hard to get primed. Luckily I have lots of experience with grease guns. The instructions for the charger are wrong. One of the batteries was bad and they promptly shipped another one. I also agree with the fitting on end of hose being very hard to remove...bad design. I will be changing it out today with one from my manual Alemite grease gun.
Makes greasing my equipment so much easier and efficient. I am glad to have purchased this product. Great product, good price.
The grease gun won't pick up the grease. Tried two different tubes of grease and spend about two hours to get it work.
My husband works at a Barite mine and has alot of greasing to do. Recently bought this grease gun and could not be more satisfied with it. He says it works great and makes his life that much easier :)We would highly recommend this product to others.
Answer: yes