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We have a 12 speed with the air shifter. It is leaking air on the bottom of the air shifter.. This is on the top back of transmission. cant' really get in there to look but is there a plug on the bottom of the high range shifter .. Doesn't leak only till high range.. Appears to be a threaded hole there..Other wise from my understanding it's a big job to replace the shifter. Also looking for a parts breakdown of the same shifter.. Thank you

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another Mack trans problem ???

  • Haha 1

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If your Mack dealer is as good as mine they can fax or email you the parts diagram, but you'll need to give them a little more info... Year? Transmission model? 

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  Had a mack guy look at it.. said the top of transmission has to come off.. his guess O-rings or broken piston.. will keep you posted .. thanks.. this on 94 rb mack 

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You can get those off and on with the trans in chassis. It’s a real skill shot. May have to raise the cab a little, worse case scenario.

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18 hours ago, sri said:

  Had a mack guy look at it.. said the top of transmission has to come off.. his guess O-rings or broken piston.. will keep you posted .. thanks.. this on 94 rb mack 

Is IT a 12 OR Is it a 13 speed???? Big difference !!!!  If its a 12 the air shifter  has reverse on the knob as well if its a 12  the orings on the hi low split can be changed with out removing the lid! all orings can be changed except the shaft oring which rarely leaks!

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On ‎9‎/‎22‎/‎2019 at 9:46 AM, fjh said:

Is IT a 12 OR Is it a 13 speed???? Big difference !!!!  If its a 12 the air shifter  has reverse on the knob as well if its a 12  the orings on the hi low split can be changed with out removing the lid! all orings can be changed except the shaft oring which rarely leaks!

tried to post a picture of shifter but failed.. it says it's a maxitorque extended range 12 speed with splitter . On shifter knob in cab has high ,direct, neutral and reverse

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The bigger of the two cylinders ! get the orings and a snap ring  before you disassemble  the cylinder snap ring has been known to break and cause the symptom you describe at the rear it can be accessed at the rear of the trans Without removing the lid!

 

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watermark.jpg&t=1569253947

KEY PAI REFERENCE EXCEL NO. OEM REFERENCE DESCRIPTION REFERENCE INFORMATION
1 GSI-0616   MAK136KC25BP1 INTERLOCK  
1 Call   MAK136KC312 INTERLOCK  
2 Call   MAK393KB420A COVER  
3 GSC-0009   MAK6AX1308X SCREW(3/8in-16 x 1-1/4in) NAV 60001R91
4 BWA-0066   MAK37AX265 WASHER  
5 GSP-1674   MAK107KD140 SPRING  
6 GDB-1665   MAK48AX17 BALL MAK 48AX11
7 GSP-1672   MAK107KD116 SPRING  
8 GSP-1676   MAK107KD157 SPRING MAK 107KD1177
9 Call   MAK413KB13 COVER  
10 ESC-0035   MAK6AX1359X SCREW(3/8in-16 x 1in) MAK 6AX1274X
NAV 1670574C1
11 GGS-3970-007   MAK628KB124 GASKET  
12 MSW-4396   MAK1MR2297 SWITCH,Reverse NAV 454925C1
MAK 1MR1320
13 Call   MAK408KB217A COVER  
14 EPP-3575   MAK49AX234Z PLUG NAV 444631
15 Call   MAK136KC120 PLUNGER  
16 Call   MAK6AX1313 SCREW  
17 BGA-3009   MAK56AX438 O-RING,Lo/Direct Shift(4 Req'd)  
18 BGA-3004   MAK56AX436 O-RING,Lo/Direct Range Shift
  (2 Req'd)
MAK 56AX546
19 GSH-1714   MAK591KC2283A RAIL,Reverse  
20 BGA-3003   MAK56AX437 O-RING  
21 BGA-3007   MAK56AX434 O-RING  
22 Call   MAK414KB262 COVER  
23 Call   MAK6AX1292X SCREW  
24 GPA-2204   MAK336KC232 PISTON,Lo Range  
25 BGA-3008   MAK56AX441 O-RING,Direct Shift(2 Req'd)  
26 BGA-3006   MAK56AX439 O-RING(2 Req'd)  
27 BGA-3005   MAK56AX440 O-RING(2 Req'd)  
28 Call   MAK6AX1314 SCREW  
29 Call   MAK414KB2127 COVER  
30 GBF-6443   MAK541KB19 BREATHER  
31 GAC-2206   MAK476KB316A CYLINDER,Airshift  
32 GSH-1694   MAK591KC2322 RAIL,Direct(TRTXL-1070)  
32 Call   MAK591KC2294B RAIL,Direct(TRTXL-107)  
33 GPA-2205   MAK336KC265 PISTON,Direct MAK 336KC238
34 GKP-3489   MAK79AX75Z PLUG NAV 1662500C1
MAK 79AX4
35 Call   MAK502KB113 DOWEL  
36 GSC-6116 EF61160 MAK7AX264X SCREW,Lock(Dog Point) MAK 7AX152
MAK 7AX255
37 GSL-0624   MAK170KC276 LEVER,Reverse  
38 GSL-0625   MAK170KC292 LEVER,Direct  
39 Call   MAK79AX58 PLUG  
40 Call   MAK35AX1028 WASHER  
41 Call   MAK22AX40 NUT  
42 GGS-3970-004   MAK616KB37 GASKET,Cover,Compound  
43 GSF-0623   MAK699KC2132C SHIFTER,1st/Reverse MAK 699KC351
44 Call   MAK591KC2266A RAIL,1st/Reverse(TRTXL-1070)  
45 GSP-3103   MAK31KD1151 SPACER  
46 GSF-0650   MAK575KB3128A FORK,1st  
47 Call   MAK575KB3153 FORK,Reverse  
48 GKP-3496   MAK79AX35 PLUG(1in Welch)  
49 GSF-0622   MAK699KC2126C SHIFTER,2nd/3rd MAK 699KC350
50 GSH-1685   MAK591KC2277B RAIL,2nd/3rd(TRTXL-107)  
50 GSH-1687   MAK591KC2281A RAIL,2nd/3rd(TRTXL-1070)  
51 GSF-0630   MAK575KB3130A FORK,2nd/3rd  
52 GSF-0635   MAK575KB3170B FORK,Direct MAK 575KB3208
53 GSH-1695   MAK591KC2327A RAIL,Direct  
54 Call   MAK699KC2148 SHIFTER,4th/5th  
55 GSH-1692   MAK591KC2214A RAIL,4th/5th(TRTXL-107)  
55 Call   MAK591KC2228A RAIL,4th/5th(TRTXL-1070)  
56 Call   MAK591KC2232P1 RAIL,Compound (TRTXL-1070)  
56 Call   MAK591KC325 RAIL,Compound(TRTXL-107)  
57 Call   MAK7AX265X SCREW  
58 GSF-0621   MAK575KB394H FORK,4th/5th  
59 GOS-6182   MAK88AX370P3 SEAL CHI 7414
NAT 1049
60 GSF-0657   MAK575KB42C FORK,Compound  
61 GRI-2702   MAK97AX121 RING,Retaining  
62 FKT-1148   MAK14RC1131 KIT,Valve,Major  
63 GRI-2703   MAK97AX126 RING,Retaining  
64 FKT-1147   MAK14RC1130 KIT,Valve,Minor  
65 GBK-6562-100   MAK342SH594 KIT,Retaining Ring
  Includes Rings (1)GRI-2701
    (1)GRI-2703 (1)GRI-2711 (1)GRI-2712
    (1)GRI-2713 (3)GRI-2715 (3)GRI-2716
    (1)GRI-2719 (1)GRI-2731 (1)GRI-2732
    (3)GRI-2734 (9)GRI-2735 (1)ESR-2832
    (1)GRI-2733 (3)GRI-2704 (1)GRI-2702
    (6)GRI-2706 (12)GRI-2707 (1)GRI-2714
    (2)GRI-2717 (4)GRI-2718 (1)GRI-2794
 
66 GBK-6562-200   MAK207SH32 KIT,O-Ring
  Includes O-Rings (2)BGA-3004
    (1)BGA-3003 (4)BGA-3008 (2)BGA-3005
    (4)BGA-3009 (2)BGA-3006 (1)GGA-2993
    (1)BGA-3007 (1)ER64420
  Lubricant (1)GSL-0383
  Breather (1)ER64420
 
67 GSP-1679   MAK107KD1172 SPRING(TRTXL-1070)  
newitem.gif68 LSV-3692-002   MAK9054-P58987 ROTOR

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what part numbers would that be... you are talking to a novice here so give me some time. Don't think we want to tackle this job but can give the advice to who is going to do it..  Three experts said the top has to come off.. I don't have a clue.. Only use this for 500 miles a year for corn harvest. plan is to run it like it is,mostly in direct ,then this winter they can have at it... what would happen if the hole is plugged. Don't want to blow the top of transmission off

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Good Job Bro The easy fix check is done  Best advice I have now is to get your work done don't  use the split till ya got time to deal with removing the shift lid! There are two other semi common things that can happen ,The shift rail engagement knob has come loose on the piston rod you can deal with that when the lid is off!  OR  you have a broken shift rail , For this The trans has to come out PAI Is the place to by the parts ! And This is not the place to do a farmer patch the shift rail is a big project Trany out and into three pieces on the floor You need a nice warm barn to tackle this project in the winter! 😁

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got someone to do it this winter.. It does shift and stay in high ,just leaks a lot of air.. So think the linkage is not broken.. will keep you posted later.. What would happen if the vent hole is plugged????

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It would pressurize both sides and the fork would freely slide back and forth, destroying the gears? The air moves it and holds it too I expect.

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