Quickfarms Posted December 16, 2019 Author Share Posted December 16, 2019 I cleaned up the bubble gum and got the spring back in there Now it's time for lunch, a shower and off to real work 2 Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-438196 Share on other sites More sharing options...
j hancock Posted December 17, 2019 Share Posted December 17, 2019 Now ready for another million shifts! Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-438237 Share on other sites More sharing options...
Quickfarms Posted December 22, 2019 Author Share Posted December 22, 2019 All painted and back in but it's dark so no picture with it mounted, just painted Is the boot that goes over the ball available?Also removed the floor mat and padding because the padding was wet.Lots of surface rust from some open holes in the roof and a big dent at the back corner of the AC unit. All caulked for now 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-438543 Share on other sites More sharing options...
Quickfarms Posted December 23, 2019 Author Share Posted December 23, 2019 It's still leaking in the rainAny ideas on where to look, I don't see where it is leaking, I just have water on the floor Are the gaskets for the small lights available Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-438721 Share on other sites More sharing options...
terry Posted December 24, 2019 Share Posted December 24, 2019 The vent gasket on top of the cab are notorious for leaking. terry Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-438725 Share on other sites More sharing options...
david wild Posted December 24, 2019 Share Posted December 24, 2019 vent on roof Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-438740 Share on other sites More sharing options...
Quickfarms Posted December 24, 2019 Author Share Posted December 24, 2019 That's going to be interesting The back portion of the gasket between the roof vent and roof is under the roof top ACI think I will remove the headliner tomorrow Can you get a replacement plastic headliner or how can the plastic be repaired? Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-438747 Share on other sites More sharing options...
mrsmackpaul Posted December 24, 2019 Share Posted December 24, 2019 You could still buy the molded plastic headliner in Australia a couple of years ago Was over a thousand bucks then Paul Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-438749 Share on other sites More sharing options...
Quickfarms Posted December 25, 2019 Author Share Posted December 25, 2019 Pulled the headliner down and there is nothing obvious Except a bad roof repair What should the air horn valve look like? This does not look correct Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-438798 Share on other sites More sharing options...
h67st Posted December 26, 2019 Share Posted December 26, 2019 On 12/24/2019 at 10:23 PM, Quickfarms said: Pulled the headliner down and there is nothing obvious Except a bad roof repair What should the air horn valve look like? This does not look correct On my H model the valve threads right into the bottom of the horn. Yours looks like a dual horn setup. Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-438880 Share on other sites More sharing options...
Quickfarms Posted December 26, 2019 Author Share Posted December 26, 2019 The horn valve installation on the 1975 is similar but different from the installation on my 1985 RS688LST Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-438901 Share on other sites More sharing options...
Quickfarms Posted December 30, 2019 Author Share Posted December 30, 2019 I got the jake brake to work this weekend. The first issue I found was that there were no wires going to the throttle position switchAfter jumping around the switch I still had nothing. So I connected the solenoid wire directly to the battery and they worked. After separating the solenoids and playing with them a few times they were each working a working better . I wonder if it was sticky from not being used for who know how long.Today the dash switch was working, still with a jumper around the throttle position switch, there is a couple second delay and then the jake brake tries to kill the engine. Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439068 Share on other sites More sharing options...
Freightrain Posted December 30, 2019 Share Posted December 30, 2019 (edited) Typical delay, especially at idle. It takes oil pressure to actuate the Pistons. Usually first hit on mine takes a few seconds longer then from then on when the system has been fully filled with oil. It will kill the engine at idle, thus the throttle and clutch switches. Edited December 30, 2019 by Freightrain Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439090 Share on other sites More sharing options...
Quickfarms Posted December 31, 2019 Author Share Posted December 31, 2019 This is my test wiring 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439099 Share on other sites More sharing options...
Lmackattack Posted December 31, 2019 Share Posted December 31, 2019 On 12/23/2019 at 4:54 PM, Quickfarms said: It's still leaking in the rain Any ideas on where to look, I don't see where it is leaking, I just have water on the floor Are the gaskets for the small lights available first look to see if its leaking at the roof vent or A/C unit. My 77 western had a roof mount AC unit and I ended up having to replace the whole roof sheet metal because of the rust issues it caused. if no signs of water from the roof I would suspect the rain rail has rusted out someplace and water is running down the A pillar. I have also seen water get in thru the cowl vent and fire wall with all the cables and such that run thru the wall and dont have properly sized grommets. Driver side kick vent is also suspect as it had s rubber seal when the vent is closed Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439101 Share on other sites More sharing options...
Quickfarms Posted January 4, 2020 Author Share Posted January 4, 2020 What's the best way to remove the drag link, control valve.I changed the filter and fluid but the power steering only works turning right, no assistance turning left. Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439433 Share on other sites More sharing options...
Rob Posted January 4, 2020 Share Posted January 4, 2020 In the photo there is a large cotter pin circled in yellow on the left side. Remove this pin and it runs through the center of a large flat trough. Use a large screwdriver or suitable tool and untread this adjuster plug. The end will pull from the ball stud in the pitman arm attached to the steering gear. The other yellow circle on the right is just a large tie rod end. Remove the cotter pin, loosen the castleated nut till three or four threads remain, and smack the arm this end mounts to with a four pound sledge and it will drop free. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439436 Share on other sites More sharing options...
Quickfarms Posted January 4, 2020 Author Share Posted January 4, 2020 Monday I am going to call garrison to see if they will rebuild the valve since they are local. How hard is it to rebuild one of these or should I take it to a shop to have it done? Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439443 Share on other sites More sharing options...
HarryS Posted January 4, 2020 Share Posted January 4, 2020 I'll be curious to see if they can rebuild the unit. I have the same set up. It works fine but has multiple leaks. Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439444 Share on other sites More sharing options...
Rob Posted January 4, 2020 Share Posted January 4, 2020 48 minutes ago, Quickfarms said: Monday I am going to call garrison to see if they will rebuild the valve since they are local. How hard is it to rebuild one of these or should I take it to a shop to have it done? Either have Garrison rebuild your's if they still offer the service, or a new unit. I never had long term success with a reman unit when they were available. It wears internally through use and is not readily rebuildable on a bench. I'm not speaking from direct experience but what I was told years ago. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439446 Share on other sites More sharing options...
JoeH Posted January 4, 2020 Share Posted January 4, 2020 Flip the castleated but upside down and set it flush with stud before smacking it. Gives you more surface area to distribute the hammer blow, yielding less damage to nut & stud. Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439450 Share on other sites More sharing options...
Freightrain Posted January 4, 2020 Share Posted January 4, 2020 (edited) If you get a solid hit on the round part of the arm(around the stud) you don't have to hit the nut/stud. The shock on the arm will dislodge the taper. Might take a few whacks. Edited January 4, 2020 by Freightrain Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439460 Share on other sites More sharing options...
Rob Posted January 4, 2020 Share Posted January 4, 2020 That's the way I've always done it and you won't damage anything. Four pound sledge usually makes it a "One Smack" affair. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439461 Share on other sites More sharing options...
Quickfarms Posted January 8, 2020 Author Share Posted January 8, 2020 The draglink end is still stuck on the pitman arm and has not budged. I smacked the side with the 4lb and nothing. I then flipped the castle nut and hit it repeatedly and still nothing. I even tried some heat and that did is make the grease smokeAny ideas?The good news is I was able to unscrew the control valve by hand after removing the clampThis afternoon the control valve was delivered to garrison for rebuild or remanufacure. They said almost all the parts are still available. If the valve is leaking through the spool they said usually the bore cannot be honed and must be replaced Quote Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439771 Share on other sites More sharing options...
Freightrain Posted January 8, 2020 Share Posted January 8, 2020 Rarely do they fall off easily, unless they have been off "recently". I see the flat spot on the top edge, try deeper around the center, and work around the side that is accessible. It will come, just need to get that one lucky hit. I went through this when I swapped on the air steering parts to my truck. After 50 years, things get stuck pretty tight. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/54460-1975-rs685lt/page/4/#findComment-439774 Share on other sites More sharing options...
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