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      This forum is for general discussions about modern Mack Trucks! Granite, Vision, Rawhide, Pinnacle...etc. Specific topics can be posted in the forums below.

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    3. Other Truck Makes

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    4. Transportation Board

      This forum is for posting and finding transportation opportunities for your antique hobby trucks and parts around the country. Please keep rates reasonable when posting a route...

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    5. Watt's Truck Center   (232,596 visits to this link)

      Click here to visit the Watt's Truck Center Home Page featuring The B-Model Store and tons of other parts for Antique and Classic Mack Trucks including R-Models, Super-Liners, DM's and all current models!

    6. Product Announcements & Group Buys

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  6. Shows and Events

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    2. BMT Wiki Support Topics

      This forum will hold the support topics created from the Wiki System.

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    3. Test Forum

      This is the place to practice posting photos or testing code. Topics may be removed at any time...

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  8. Club Forums

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      This club page is for all Mack Memorabilia discussions

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  • Latest Posts

    • Geoff Weeks
      1992 Mack RD688s Steering Gear Drama

      By Geoff Weeks · Posted

      Here is a better explanation as to why speedi seal will not work in this application. Any oil seal, be it a rear main or a wheel seal, is vented to case pressure on the oil side. In a gear box or a rear axle that will be atmospheric, in a crankcase, it may be a few inches of Hg above atmospheric.  Take the vent out of a trans or rear axle and put an air fitting in there and connect to 100 psi, would you expect no oil leak? most would say no, it would leak, now raise that pressure 20 fold! That is what the high pressure shaft seal on a Shepard box has to hold back. Stretching the seal a few thousandths over a speedi sleeve will damage it.
    • mechohaulic
      300+ rebuild

      By mechohaulic · Posted

      the 1/2=2/3 method worked . far as the whack rest of the way ??; liner in 1/2 way spray WD40 or equivalent in counter bore then with clean  2X4 (and shoes) stand on top of block and body weight should push liner down. that is if the block still in frame and secured. no jumping/whacking liners. clean rag on top 2X$  to catch WD40 spray.  liners have shims under them  tad more caution needed 
    • Geoff Weeks
      1992 Mack RD688s Steering Gear Drama

      By Geoff Weeks · Posted

      Speedi sleeves increase the diameter of the shaft by a few thousandths, not an issue for wheel seals and the like but a big issue for seals that have to hold back 2000 psi. It has been a long time since I did a Shepard box, so I don't remember exactly how the seal is. Last box I had to send off for a input shaft repair IIRC it was $1200. Input shaft seal area and pitman shaft bushings are really the only thing that goes wrong on those boxes.  There is a fitting on the side that you can pump grease in between the high pressure and dirt seal, to keep grit out of the high pressure seal area, if this is done regularly it helps keep the high pressure seal in good shape. The grease forces any dirt up and out. Just one pump every oil change is all it takes.  
    • mechohaulic
      Connecticut Construction Trucks

      By mechohaulic · Posted

      back  a" few "years ago while at Mack I installed at least 8-10 osculators on Blakeslee massive DM's. don't recall exactly but they may have been a modern day Apgar. two lock pins rear of deck similar. not sure of the locking slot on turn table. 
    • mowerman
      1992 Mack RD688s Steering Gear Drama

      By mowerman · Posted

      I still don’t know why the sleeve didn’t work and I was also surprised that you were able to get one 
    • mowerman
      300+ rebuild

      By mowerman · Posted

      Good luck mine went right in with chunk of wood and light taps with a hammer  after dropping in around 2/3 the way
    • Joey Mack
      300+ rebuild

      By Joey Mack · Posted

      Dammit Man...  i wish i still had my extra parts. I sent them back with the engine i built. I dont have the part numbers
    • mowerman
      R model cowl vent

      By mowerman · Posted

      Well at my age I’m worried about dumping all this dough into this thing and croak before I get to enjoy finished product… Bob 

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    • mowerman

      mowerman  »  1Macktrk

      Hey, welcome my board and have a swinging time… bob
      · 0 replies
    • Lmackattack

      Lmackattack

      HO HO HO

      · 0 replies
    • the_IRFmack

      the_IRFmack

      - I double sticked and old Mack to feed a stone crusher in 12 and 14 hour shifts six days a week all summer to pay for my chemistry degree.
      - Because I wanted to sleep for 1 min and 26 seconds each trip out of the quarry at the crusher's vibratory dump box at the top the quarry during those 12 hour shifts, I bulled the old MACK up long 20 degree and sometimes steeper grades.
      - THAT meant that I split each gear 1, 2, 3 after coming out of boggy low.
      - All I did was rev to the right engine note, reach my left arm down through the steering wheel to hold the curve I was on or hold the truck's path steady; slip out of 1st, throw the 2nd stick high into low and slip into 2nd gear... rev to the right engine pitch, slip to high.
      - Then when it was time, reach through the wheel again, slip high to low and 2nd to 3rd {if I correctly remember 60 years ago}.
      - The Igneous rocks were too heavy and the grade too steep for me to ever get into 3rd high.
      - The crusher team were the mechanics for everything and had replaced the old Mack's tranny gears because they had been ground too much. - - They later told me they didn't believe me when I told them I slipped all my shifts because the gears showed no wear.
      - Except for start and stop; Not once did I use the clutch because that made my leg ache too much after an hour or so.
      - I slipped all my standard 4 speed shift vehicles all my life...just to be with the music of the engine and car or truck.
      · 0 replies
    • the_IRFmack

      the_IRFmack

      - I hardly ever change disc pads or brake shoes because I always slipped my gears downshifting...
      _ I learned that because the synchro rings got shot on my 1968 Volvo 122S 2-Door 4-Speed with an electric overdrive because I stupidly speed shifted and ruined them. https://bringatrailer.com/listing/1968-volvo-122s-17/
      - [Note: That Volvo's original owner was a Canadian Submarine Captain who rallied it and that is why it had Volvo's unique electric overdrive.]
       
      - {I clear coated over the bone white with Cadillac Firemist Green and painted the grills Black because they were dented...gosh it was stunning.}

      · 0 replies
    • Richie s

      Richie s

      My phone number is 845 475 7176 if anyone can help with parts
      · 0 replies

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