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p. 3 of 11 

 

 
 

 

 

                                                 

1.  VEHICLE PREP. 

 

1.1   Remove both grab handles (one per side) (see fig. 1.1). 
1.2   Remove, and discard the outer bolt and nut in each floorboard (see fig. 1.1). 
1.3   Remove, and 

save

 two (2) plastic pins (per side) holding the floor mat down     

        (see fig. 1.1). 
1.4   Tip driver’s seat forward. 
1.5   Drill an oversized hole (3/8” dia.) thru plastic located behind seat and   
        shown in fig. 1.5. The drilled hole is to be exactly over the center of the   
        left weld nut. Transfer the hole location from the bottom up. (Note: take pre                              

cautions to avoid damaging the metric threads in the nuts welded below.) 
( Suggestion: wedge plastic up in the air with a small piece of wood to keep 
drill bit away from weld nut threads.) This hole will be used to fasten the rear 
panel assembly in place (ref.: see fig. 2.3.1). 

 

2.  REAR PANEL ASSEMBLY 

 

2.1   Pre-assemble lower rear panel, rear legs, and rear window support using a   
        total of eight (8) button head screws. (Note: the soft side version does not   
        have a rear window support). See fig. 2.1 for the all steel pre-assembly. To   
        attach the rear window support, use four 5/16” button head screws, steel   
        washers, and nylon washers. To attach the lower rear panel, use four 5/16”   
        button head screws, steel washers, nylon washers, and locknuts. 
2.2   Install two (2) pieces of 1” round bulb rubber (28” long) on three (3) edges   
        per side as shown in fig. 2.1. 
2.3   With assistance, and from the side of the tractor, place the pre-assembled unit  
        behind the seat and in between the roll bar uprights (see fig. 2.3). (Make sure  
        the rubber seal that will rest on top of the fenders is facing outwards.) Secure  
        the bottom of the rear panel (thru the newly drilled hole) to the left metric 

weld nut already in place. (See fig. 2.3.1) Use a 6mm x 1.0 x 20mm long hex. 
head bolt and 6mm flat washer from the hardware kit. 

2.4   Secure the lower rear panel to the roll bar using the existing roll bar bolts as  
        shown in fig. 2.4. Attach the rear panel mounts to the rear panel with the    
        locknuts being on the inside of the cab. Use two button head screws, plastic  
        washers, steel washers, and locknuts. 

 

Fig. 1.5 Drill holes in plastic 

  CABS/BLADES/ SPREADERS/ACCESSORIES 

   Fig. 1.1 Remove grab handle,   
   bolt, and two plastic pins/side 

plastic pins 

bolt 

drill  

Fig. 2.3 Install 
Rear Panel 
Assembly 

Fig. 2.4 
Rear Panel 
Mount 

roll bar bolt 

Fig. 2.1 
Pre-assemble 
Rear Panel 

Fig. 2.3.1 
Secure 
Rear Panel 

metric bolt 

not on 
S.S. cabs 

1” round bulb 

Summary of Contents for JOHN DEERE 4120

Page 1: ... by qualified experienced operators only Exposure to Carbon Monoxide can Cause illness serious injury or death Never operate vehicle if suspicious of Carbon Monoxide Inspect exhaust system for leaks monthly Leaks can result from loose connections corrosion cracks or other damage to the exhaust manifold If leaks are found repair or replace exhaust system Do not use vehicle until repair or replaceme...

Page 2: ...is designed and manu factured for use only as reasonable weather protection This cab is not applicable nor should the cab be considered as protection against roll over collision or other accidents that may result This cabs is NOT a R O P S cab Extreme care should be taken when operating and by qualified experienced operators only Exposure to Carbon Monoxide can Cause illness serious injury or deat...

Page 3: ... steel washers and nylon washers To attach the lower rear panel use four 5 16 button head screws steel washers nylon washers and locknuts 2 2 Install two 2 pieces of 1 round bulb rubber 28 long on three 3 edges per side as shown in fig 2 1 2 3 With assistance and from the side of the tractor place the pre assembled unit behind the seat and in between the roll bar uprights see fig 2 3 Make sure the...

Page 4: ...f two bolts 5 16 18 x 3 4 long four steel washers two nylon washers and two locknuts Install 1 bulb rubber approximately 80 along the sheet metal edges as shown in reference fig 3 2 Trim any extra bulb rubber 3 3 For the 20 Series models ref 4120 4320 4520 and 4720 Pre assemble the cowl and front legs as shown in fig 3 2 by fastening to gether at the inside hole only using two 5 16 x 3 4 long butt...

Page 5: ...the bottom of the side frame and the floorboard 5 FRONT WINDSHIELD SUPPORT 5 1 Install the front windshield support to the side frames with the bent flange down Install only the bottom two 5 16 x 3 4 long button head screws steel washers nylon washers and locknuts see fig 5 1 Note the top holes will get fasteners once the roof is installed 6 WINDSHIELD 6 1 With assistance install the windshield to...

Page 6: ...8 REAR WINDOW hard side only 8 1 Install two 2 ball studs to the inner curved surface of the window Note the Philips head portion of the screw is to be on the outside of the window The base of the ball stud goes against the inner surface of the window with the boss sitting inside the window hole Bolt these components together making sure that the ball portion of the ball stud is facing the outside...

Page 7: ...g button head screw steel washers and locknut 9 2 Re install the plastic pins to secure the floor mat 10 DOORS 10 1 Install doors onto hinges see fig 10 1 Work the doors back and forth until the hinges are completely seated NOTE the hinges inside latch and striker bolt can also be adjusted for proper engagement 10 2 On hard sided cabs install the gas springs to the frames and doors with the small ...

Page 8: ... in fig 12 4 Cut along the white lines shown on the photo being sure to cut on the appropriate side of the loop velcro The photo shows the loop velcro side up The long cut to be made should follow along the edge of the 5 8 wide loop velcro so the loop velcro remains fully intact on the small piece of vinyl that is labeled keep for 20 Series The shorter cut to be made is approximately parallel to t...

Page 9: ...t or snow from windows Do not roll curtains in cold weather The windows become stiff and may crack Keep windows clean On 20 Series models access Fuel Cap Filler as follows From inside of cab open both pop out windshield latches and disconnect latches at spring loaded finger tabs Push windshield open far enough to fully open fuel cap filler cover Close windshield completely but do not reconnect spr...

Page 10: ...2 WEATHER HEADLINER LOGO TRIM LOK QTY P N ROOF REFLECTORS 1 JD4510 01 1 4 GRIP RIGHT 1 JD4510 11R SEAL INSIDE 1 ROUND BULB JD4510AS 07R JD4510AS 07L BALL STUD HINGE SLEEVES HARD DOORS LEFT RIGHT P N 1 1 QTY 1 HEYCO PLUG ON SIDE SHOWN 1 2 WEATHER SEAL QTY P N COWL INSERT 1 JD3520 17A 1 FLAT BULB 10 SERIES BALL STUDS 5 16 INSERTS SEAL OUTSIDE 1 JD4120 15R RIGHT 1 2 WEATHER 1 JD4120 10L 1 JD4120 10R ...

Page 11: ... INSIDE 1 2 WEATHER QTY P N COWL 1 JD4120 08A HEYCO PLUGS R O P S SERIAL OPTIONS DECALS INSIDE RIGHT 2 JD4510 12 FILLERS FRONT QTY P N LEFT WINDSHIELD SUPPORT 1 JD4120 04 QTY P N REAR FILLER QTY P N 1 JD4510 16 1 JD4120 10L LEFT PLUGS 1 FLAT BULB HEYCO RIGHT 1 2 WEATHER SEAL INSIDE 1 JD4120 10R QTY P N FRONT LEGS LATCHES RIGHT 1 JD4510 11R SEAL INSIDE QTY P N REAR LEGS LEFT 1 2 WEATHER SEAL OUTSID...

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