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DESIGN CONCEPT  

 

Curtis Cabs feature an assembly of parts designed for your vehicle which require  
adjustment and alignment of components to accommodate vehicle variations and  
provide proper weather protection. For accurate installation, proper operation, and 
years of satisfaction, please read and understand the installation instructions. 
 
From all of us at Curtis, we thank you for choosing our product. 

 

 

 
CAB INSTALLATION 

BEFORE YOU START 

HELPFUL REMINDERS: 

            A. Leave all bolts loose for later adjustment unless otherwise specified. 
            B. Read and understand all instructions before beginning. 
            C. Plastic washers have been supplied to provide a weather seal around 
                all exterior fasteners. The plastic washer should be installed under each 
                bolt head directly against the outside cab surface. Care should be taken 
                not to over tighten the fasteners and damage the plastic washer. 
                Also use metal washers as required. 
           D. Apply a clear silicone sealant to seal any minor gaps that may occur due  
                to vehicle variances. For example, windshield cowl to unitized frames. 
 

TOOLS REQUIRED: 
           

   

 
  
                          

 

  This Curtis Cab 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

 

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 replace- 
ment is complete. 

  driver and passenger.

  exceed the vehicles rated capacity including

  from the vehicles rated capacity and never

  brochures. Deduct the accessories total weight

  Curtis accessory weights are listed in product

  add additional weight to the base vehicle. All

  Curtis Cabs, blades and general accessories

ADDED

WEIGHT

7/16”, 1/2”, 7/8”, and 1” 
OPEN END WRENCHES 

    7/16 IN. 
3/8 DRIVE 
  SOCKET 

   1/2 IN. 
3/8 DRIVE 
   DEEP 
 SOCKET 

3/8” DRIVE 
RATCHET 

NO. 2 MEDIUM 
PHILLIPS HEAD 
SCREWDRIVER 

     3/8 IN. 
  ELECTRIC 
HAND DRILL 

   3/8 IN. 
DRILL BIT 

 3/16 INCH 
ALLEN 
DRIVE  
3/8 DRIVE 

   10MM 
3/8 DRIVE 
 SOCKET 

p. 2 of 11 

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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