Scott74 Posted August 11, 2022 Share Posted August 11, 2022 I am looking for a place to get new power steering cylinders for my 1974 Mack RL700L. Or does anyone know if they have an updated kit for the power steering? Quote Link to comment https://www.bigmacktrucks.com/topic/70272-73-rl700l-help/ Share on other sites More sharing options...
Quickfarms Posted August 11, 2022 Share Posted August 11, 2022 Since you say power steering cylinder I suspect that you have an ad on system and not an integrated power steering box if it is a garrison system. Garrison is still in business and will rebuild there system Please post some pictures of the system so we can help you 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70272-73-rl700l-help/#findComment-505980 Share on other sites More sharing options...
Scott74 Posted August 12, 2022 Author Share Posted August 12, 2022 Yes it is a hydraulic system using a cylinder off of the pitman arm with 4 hoses attached, then another cylinder underneath by cross member with 2 hoses attached. I will take some pictures in the morning. Thanks for the help! Quote Link to comment https://www.bigmacktrucks.com/topic/70272-73-rl700l-help/#findComment-505999 Share on other sites More sharing options...
Quickfarms Posted August 12, 2022 Share Posted August 12, 2022 Why do you think the cylinder needs to be replaced? Quote Link to comment https://www.bigmacktrucks.com/topic/70272-73-rl700l-help/#findComment-506045 Share on other sites More sharing options...
Scott74 Posted August 12, 2022 Author Share Posted August 12, 2022 It leaks like a son of a gun. Both do. I'm going to take them off today and see if I can get seals to rebuild them. Quote Link to comment https://www.bigmacktrucks.com/topic/70272-73-rl700l-help/#findComment-506049 Share on other sites More sharing options...
mechohaulic Posted August 12, 2022 Share Posted August 12, 2022 I'm confused (not first time ) is it a hyd system or air assist ?pitman arm has valve body and tie rod has an air cyl. it's been a number of yrs; can't recall hyd system being described Quote Link to comment https://www.bigmacktrucks.com/topic/70272-73-rl700l-help/#findComment-506050 Share on other sites More sharing options...
Scott74 Posted August 12, 2022 Author Share Posted August 12, 2022 It's hydraulic. I bought the truck on auction so I'm not sure if this system is original or not. It has a power steering pump that is gear driven behind the air compressor on the passenger side of the truck. Four lines go to the cylinder that's connected to the pitman arm which is attached to the steering gear box. Two hoses from this cylinder go to the cylinder under the truck that runs parallel with the cross member. VIN is RL786LST24497 Quote Link to comment https://www.bigmacktrucks.com/topic/70272-73-rl700l-help/#findComment-506052 Share on other sites More sharing options...
Quickfarms Posted August 12, 2022 Share Posted August 12, 2022 (edited) Is it the cylinder that connects the steering box to the pitman arm that is leaking? This is actually the control valve. this is a garrison control and to the right of the fittings it says garrison, has the part number and date stamped in the body. Edited August 12, 2022 by Quickfarms Quote Link to comment https://www.bigmacktrucks.com/topic/70272-73-rl700l-help/#findComment-506054 Share on other sites More sharing options...
Scott74 Posted August 12, 2022 Author Share Posted August 12, 2022 Yes that is exactly what it is. Do they still make those or do you recommend rebuilding the one I have? Quote Link to comment https://www.bigmacktrucks.com/topic/70272-73-rl700l-help/#findComment-506060 Share on other sites More sharing options...
Quickfarms Posted August 12, 2022 Share Posted August 12, 2022 Garrison can rebuild or remanufacture it. the end piece that the tie rod screws into is NLA if you pm me your email address I can send you the manuals Quote Link to comment https://www.bigmacktrucks.com/topic/70272-73-rl700l-help/#findComment-506068 Share on other sites More sharing options...
Paddy Boy Posted August 18, 2022 Share Posted August 18, 2022 On 8/12/2022 at 8:18 AM, Scott74 said: It's hydraulic. I bought the truck on auction so I'm not sure if this system is original or not. It has a power steering pump that is gear driven behind the air compressor on the passenger side of the truck. Four lines go to the cylinder that's connected to the pitman arm which is attached to the steering gear box. Two hoses from this cylinder go to the cylinder under the truck that runs parallel with the cross member. VIN is RL786LST24497 Hello Scott. I was the previous owner of your truck. My VIN. You can remove the cylinder and take it to a hydraulic cylinder repair shop and they can rebuild it for you. If you are still in the market for the Shop Service Manual, I have it. I may have a couple other things for it. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70272-73-rl700l-help/#findComment-506725 Share on other sites More sharing options...
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