Popular Post Quickfarms Posted October 3, 2018 Popular Post Share Posted October 3, 2018 6 Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/ Share on other sites More sharing options...
Popular Post Quickfarms Posted October 3, 2018 Author Popular Post Share Posted October 3, 2018 I took a little road trip this week to visit my daughter at college because two of my chocolate labs died in the last week and this morning I bought this truck 4 Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407101 Share on other sites More sharing options...
seyser Posted October 3, 2018 Share Posted October 3, 2018 Nice looking truck. Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407103 Share on other sites More sharing options...
kscarbel2 Posted October 3, 2018 Share Posted October 3, 2018 That's an earlier version with the one-piece grille (versus the later 3-piece). Nice truck. Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407106 Share on other sites More sharing options...
ZDB Posted October 3, 2018 Share Posted October 3, 2018 That is a cool looking old Mack the Flatbed crane combo should really be handy! Sorry for your loss, went thru it this year too. Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407108 Share on other sites More sharing options...
Popular Post Quickfarms Posted October 3, 2018 Author Popular Post Share Posted October 3, 2018 It was originally an Arizona State truckSome pictures of from 1991 when the person I bought from bought it from the dealer after the state sold it 5 Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407124 Share on other sites More sharing options...
HarryS Posted October 3, 2018 Share Posted October 3, 2018 Sorry for your loss. We just lost our 15 year four legged companion. Happy for you new acquisition. Nice! Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407129 Share on other sites More sharing options...
Vladislav Posted October 3, 2018 Share Posted October 3, 2018 Nice looking R and the crane/flatbed combo is sure always handy. Is that a Hayward built unit? Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407140 Share on other sites More sharing options...
Jamaican Bulldog Posted October 3, 2018 Share Posted October 3, 2018 Does that have a Detroit engine based on the height of the hood? Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407148 Share on other sites More sharing options...
Quickfarms Posted October 3, 2018 Author Share Posted October 3, 2018 Nice looking R and the crane/flatbed combo is sure always handy. Is that a Hayward built unit?Yes it is and the bed was made in Oakland 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407149 Share on other sites More sharing options...
Quickfarms Posted October 3, 2018 Author Share Posted October 3, 2018 Both of the battery box covers are missing. Are the aluminum covers available? Since this is a California truck, is there an issue with only running two batteries? If I continue to run two batteries would it be hard to put both of them in one battery box? Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407150 Share on other sites More sharing options...
Outbehindthebarn Posted October 4, 2018 Share Posted October 4, 2018 White wheel Quote Fun is what they fine you for!My name is Bob Buckman sir,. . . and I hate truckers. Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407156 Share on other sites More sharing options...
Quickfarms Posted October 4, 2018 Author Share Posted October 4, 2018 White wheel:banana:What does that mean? Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407160 Share on other sites More sharing options...
Quickfarms Posted October 4, 2018 Author Share Posted October 4, 2018 Does anyone know what the make and part number is for the proportioning relay valve that is located inside the passenger side frame rail just behind the radiator?It's venting air out the bottom when the foot valve is depressed Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407161 Share on other sites More sharing options...
Maddog13407 Posted October 4, 2018 Share Posted October 4, 2018 (edited) id take those battery boxes off and throw them in the scrap aluminum pile and put the eastern ones on with the X on the front. only thing those are good for is fallin on your ass when the cover slips off. otherwise that truck is such a honey. bias ply tires and all. Edited October 4, 2018 by Maddog13407 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407166 Share on other sites More sharing options...
Quickfarms Posted October 4, 2018 Author Share Posted October 4, 2018 Does that have a Detroit engine based on the height of the hood? No MackENDT675 With a Mack 5 speed direct trans Any idea what the block above the filters purpose is. It appears that there is a fitting on each side that is not connected Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407182 Share on other sites More sharing options...
Vladislav Posted October 4, 2018 Share Posted October 4, 2018 Those Western battery box bottoms don't suit Eastern covers, no matter aluminium or steel. Two batteries would be quite enough to start and drive your truck, especially in your warm region. I have two batteries installed in one Eastern box which looks smaller than yours. The only and important thing you should insulate the terminals in the other box very well. Otherwise some inside the box welding or a blast in the other inside might happen. No ideas on the matter of the device atop of the filter. Pretty sure it's an aftermarket thing. Could be a water sensor if the filter is a fuel one. The location of the filter itself doesn't seem familiar to me either. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407185 Share on other sites More sharing options...
terry Posted October 4, 2018 Share Posted October 4, 2018 9 hours ago, Quickfarms said: Does anyone know what the make and part number is for the proportioning relay valve that is located inside the passenger side frame rail just behind the radiator? It's venting air out the bottom when the foot valve is depressed Sounds like a quick release valve for the steer axle, any truck parts place should be able to match up. terry Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407188 Share on other sites More sharing options...
j hancock Posted October 4, 2018 Share Posted October 4, 2018 Truck looks good! No idea what the fitting is? Doesn't appear to be OEM. Sorry to hear about your pup. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407195 Share on other sites More sharing options...
Freightrain Posted October 4, 2018 Share Posted October 4, 2018 My 237 started with ease with only 2 batteries. Not a problem with these "little" engines. BTW, nice truck. That lift and bed will likely be a handy thing to have around. Kinda like a shirt pocket(sure glad to have it when you need it). Sorry to hear about your 4 legged family member. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407201 Share on other sites More sharing options...
Outbehindthebarn Posted October 4, 2018 Share Posted October 4, 2018 21 hours ago, Quickfarms said: What does that mean? White steering wheel.... I have a weakness for those in an r-model cab. Quote Fun is what they fine you for!My name is Bob Buckman sir,. . . and I hate truckers. Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407223 Share on other sites More sharing options...
Quickfarms Posted October 5, 2018 Author Share Posted October 5, 2018 Sounds like a quick release valve for the steer axle, any truck parts place should be able to match up. terry:MackLogo:I did some research and it looks like it is a bendix LQ-2 valve, I will just have the local truck parts house match it Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407234 Share on other sites More sharing options...
Quickfarms Posted October 5, 2018 Author Share Posted October 5, 2018 Does anyone have any experience with the hydraulic steering boost It looks like the drag link is the control valve, there is a ram on the front axle and it looks like there is a reservoir above the engine by the firewall. The pump appears to be located on the passenger side low It does not appear to be working at idle. Does it need some rpm to work? Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407238 Share on other sites More sharing options...
Maddog13407 Posted October 5, 2018 Share Posted October 5, 2018 wasn't sayin out an eastern top on a western bottom. id those the top and bottom in the scrap pile. deadliest piece of junk Mack ever put on a truck Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407242 Share on other sites More sharing options...
Quickfarms Posted October 5, 2018 Author Share Posted October 5, 2018 wasn't sayin out an eastern top on a western bottom. id those the top and bottom in the scrap pile. deadliest piece of junk Mack ever put on a truckOut here in California there is not a lot of Mack parts around but I understand what you are saying. If I decide to paint this truck and polish the fuel tanks, polished battery box covers would look good Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/#findComment-407253 Share on other sites More sharing options...
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