1977 JD 450c Loader has no power in reverse

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Snookdoc
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Re: 1977 JD 450c Loader has no power in reverse

Post by Snookdoc » Tue Dec 18, 2018 7:27 am

The manual shows it as a H-L-R Transmission
Adiustment
Fig.3 - Adjusting Clutch Pedal Free Travel and
Linkage for Clutch Valve
a Free travel
1 Yoke
2 Clutch fork
3 Self-locking nut
NOTE: Whenever the clutch and H-L-R clutch valve
linkage have been removed, or clutch pedal free
travel becomes /ess than specified 57 mm (2.25 in.)
or whenever H-L-R shifts too aggressively from
high to reverse. the linkage must be readjusted.
ADJUSTMENT OF CLUTCH PEDAL FREE
TRAVEL
Crawler loaders with Operator's Cab
Remove operator's seat and front floor plate.
Crawler loaders without Operator's Cab
Remove operator's seat, as well as side, front and
center floor plates.
NOTE: Before adjusting clutch pedal, make sure
that all pedals are in alignment. lf necessary, r+
align pedals.
1. Unhook clutch fork 20 (Fig. 2) from lever 2'
and loosen hex. nut 19.
2. Adjust free travel to specified 60 mm (2.35 in.
and tighten hex, nut 19.
ADJUSTMENT OF CLUTCH VALVE LINKAGE
1. Attach pressure gauge to oil accumulatc'
housing as described under "H-L-R Oil Pressure"
(see page 50-10-1 1).
2. Remove rubber plug from left-hand side c'
clutch housing (see arrow, Fig. 3).
3. Run engine at slow idle (800 rpm) and engag:
H-L-R shift lever in high, low or reverse. Reacinto
hole in clutch housing and turn se'-
locking nut clockwise until oil pressure reaches
approx. 1100 kPa (11 bar; 160 psi) and jucommences
to fall. Turn locking nut or,:
further turn so that pressure drops by 35 kP:
(0.35 bar;5 psi).
4. To check this adjustment; Depress clutch pece
8 to 10 mm (0.315 to 0.472 in.), The c
pressure should rise by 35 kPa (0.35 bar= 5 ps lf this is not the case, the adjustment is i.-
correct and must be repeated.
TM-4392

Snookdoc
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Re: 1977 JD 450c Loader has no power in reverse

Post by Snookdoc » Tue Dec 18, 2018 7:43 am

After I do the adjustment, if I don't have 160 psi is that when I need to add shims? thanks again mike

Jim B
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Location: western Maine

Re: 1977 JD 450c Loader has no power in reverse

Post by Jim B » Tue Dec 18, 2018 7:46 am

That is basically the same procedure as the US machines. You should go through all those steps to be sure the adjustments and pressures are correct. Follow the steps, don't jump around.

Snookdoc
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Joined: Sun Dec 24, 2017 8:57 pm

Re: 1977 JD 450c Loader has no power in reverse

Post by Snookdoc » Tue Dec 18, 2018 9:04 am

Ok thank you very much!!

Snookdoc
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Re: 1977 JD 450c Loader has no power in reverse

Post by Snookdoc » Tue Dec 18, 2018 4:59 pm

I couldn't get it to 2.35'" of free play where the yoke connects to the rod coming off of the clutch rod. I could get it to around 3 1/4. Pressure was around 120 in neutral. It would drop down to around 40psi when I shifted Into high lo and reverse. If I pushed the clutch in a tad and shifted between low and reverse came up to 120 and high was around 90 psi. Do hi lo and reverse all have to come back up to the higher pressure ?

Snookdoc
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Re: 1977 JD 450c Loader has no power in reverse

Post by Snookdoc » Tue Dec 18, 2018 7:42 pm

im going to get the John Deere mechanic to see what he thinks. Thanks for all of your input. Mike

Jim B
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Re: 1977 JD 450c Loader has no power in reverse

Post by Jim B » Tue Dec 18, 2018 7:48 pm

First you should see if you can determine why you can't get the free play as specified. It's off about an inch. How much wear is there in there in the pedal bushing, linkage holes and pins? Is there info in the manual on the height the pedals are supposed to be set at and adjusting them to height? If the starting point is off it could affect getting the right free play. I say that as the manual said the pedals had to be in alignment. If they are too high "at rest", you may have extra free play. Changing those may also require adjusting brakes and steering, if you have to change the height of all the pedals.

You have pressure readings but you didn't say you tried to make the adjustments to the pressure detailed in steps 2 and 3.

I can only go by what you have posted as I don't have manual to look at as we go through this. Follow the procedures as you go and when things don't come into spec, like the free play try to figure out why. You may want to make notes of what you changed and how much in case you find you need to back up on something.

Snookdoc
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Re: 1977 JD 450c Loader has no power in reverse

Post by Snookdoc » Wed Dec 19, 2018 7:01 am

There is slot of wear on the brake pedal i think the bushing is worn. I found the section on steering clutches an brakes and it gives the adjustments.i will see if i can get it all back to spec.i turned the locking nut on the clutch and the pressure went up a couple of pounds and just stayed there as I turned it clock wise, I backed it up to where it started to drop and went one turn and left it there . I didn't shim it up yet should I do that now? Is the pressure suppose to drop off and go back up to its maximium after each shift?

Snookdoc
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Joined: Sun Dec 24, 2017 8:57 pm

Re: 1977 JD 450c Loader has no power in reverse

Post by Snookdoc » Wed Dec 19, 2018 7:27 am

also when I push the clutch in the pressure didn't rise 5psi,it dropped pressure.

Snookdoc
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Re: 1977 JD 450c Loader has no power in reverse

Post by Snookdoc » Wed Dec 19, 2018 12:16 pm

Hi Jim I checked the brake and steering pedals height they are suppose to have 5.12" of travel they are all different lengths. Will try and get it back to where they were suppose to be. might take me awhile. Thanks again for all of you help mike

Jim B
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Re: 1977 JD 450c Loader has no power in reverse

Post by Jim B » Wed Dec 19, 2018 1:42 pm

Mike,

I think having the basics right by the book is the starting point and it will be time well spent doing it. Hopefully someone who has encounter one like yours will add to this for you. Good luck, Jim

Snookdoc
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Re: 1977 JD 450c Loader has no power in reverse

Post by Snookdoc » Wed Dec 19, 2018 7:51 pm

Thank you Jim will keep you posted . Lots of worn parts.

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Sabaro
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Re: 1977 JD 450c Loader has no power in reverse

Post by Sabaro » Sat Feb 02, 2019 11:13 am

Snookdoc, sorry for not seeing your questions sooner. It winter time and we have the ole girl covered up (winterized). I was able to get the clutch free play adjusted back to spec. Also I trans oil pressure close to spec psi. The trans was shifting H/L/R and had power. However the shift from R to H/L is hard every now and again. Not consistent. We were able to soften the shift by slightly stalling the shift in N before completing the shift. Our trans oil and filter needs to be changed before I try any more adjusting. I plan to get back to it in the spring once the weather is better. I’m sorry I don’t know about the 455 machine, I’m still learning about the 450c machine 🤓. I’ll update in the spring stay tuned!

Sabaro

Snookdoc
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Re: 1977 JD 450c Loader has no power in reverse

Post by Snookdoc » Fri Feb 22, 2019 6:53 am

Hi i got the pressure to 160 but lost the clutch pedal trying to adjust it . it will go down about3/4" but wont come all the way back up . Help

Snookdoc
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Re: 1977 JD 450c Loader has no power in reverse

Post by Snookdoc » Thu Feb 28, 2019 7:27 am

I figured it out.

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