Curtis New Holland Workmaster 25S Operating instructions

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INSTALLATION & OWNER’S MANUAL
New Holland Workmaster 25S
Cab with Heater (p/n: 1NHWM25SCA)
fits tractor models: Workmaster 25S
(*=Not including accessories)
Available Options:
1. Front LED Work Lights (P/N: 9LEDW4)
2. Rear LED Work Lights (P/N: 9LEDW3)
3. Strobe Light (P/N: 9LEDS2)
4. Dome Light (P/N: 9LEDD14)
5. Side View Mirrors (P/N: 9PM5)
6. Rear View Mirror (P/N: 9PM3)
7. Rear Wiper (P/N: 9PWK8512F9-11A)
8. Seal Kit (P/N: 9SK8)
9. Adaptor Kit to Mount Cab Without Loader (P/N: 1NHWM25SAK)
Approximate Installation Time *
Experienced Dealer Technician – 6 Hours
Average Dealer Technician – 8 Hours
Do-It-Yourself – 10 Hours
Approximate Product Specifications
Floorboard to Roof Height: 61.625 inches
Weight: 329 lbs.
Cab Width: 47.625 inches (w/o side mirrors)
Rev. B, 08/17/2021
P/N: IM-1NHWM25SCA
The contents of this envelope are the property of the owner. Leave with the owner when installation is complete.
While this cab kit was designed to fit on the vehicle(s) listed above, manufacturing tolerances and vehicle
assembly may affect cab fitment. It is the responsibility of the cab installer to check all vehicle pedals and
levers for full functionality and, as required, adjust the cab fitment to prevent any interference of the cab
components with the travel of pedals or levers.
Front windshield wiper and
heater comes standard
with cab. Also shown with
optional front work lights,
and side view mirrors.

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TABLE OF CONTENTS
WARNINGS, TIPS, & REQUIRED TOOLS...................................................... 3
CAB INSTALLATION.................................................................................. 4-18
CAB FEATURES & OPERATION............................................................. 19-20
CARE AND MAINTENANCE......................................................................... 21
SERVICE PARTS .................................................................................... 22-25
OPTIONAL ACCESSORIES ......................................................................... 26
TORQUE SPECIFICATIONS ................................................................... 27-28

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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 and owner’s manual fully prior to installing the cab.
From all of us at Curtis, we thank you for choosing our product.
HELPFUL HINTS:
•Refer to parts diagram found in the service parts section of this manual to help identify parts during the assembly process.
•To assist with the cab installation, leave all fasteners loose for later adjustment unless otherwise specified.
•Read and understand all instructions before beginning.
•Apply a silicone sealant to seal any minor gaps that may occur due to vehicle variations.
•Use caution to avoid damaging the factory installed threaded inserts or weld nuts. Begin the thread engagement by hand to
avoid or correct potential cross threading.
•Make sure the areas where the supplied self-adhesive hook Velcro and seals will be applied are clean, dry, and at room
temperature for best adhesion.
•Before installing parts with factory installed rubber, make sure the rubber is fully installed onto the parts for proper fit and
sealing.
driver and passenger.
Curtis accessory weights are listed in product
add additional weight to the base vehicle. All
Curtis Cabs, blades and general accessories
ADDED
WEIGHT
brochures. Deduct the accessory's total weight
from the vehicle's rated capacity and never
exceed the vehicle's rated capacity including
Exposure to Carbon Monoxide
can Cause illness, serious injury or
death. Never operate vehicle if suspicious of Carbon Monox-
ide. 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
replacement is complete.
•Set of Standard and Metric Sockets (3/8” Drive)
•3/8” Drive Ratchet with Extension
•Torque Wrench
•Set of Standard and Metric Open-End Wrenches
•Set of Standard and Metric Allen Wrenches
•#2 and #3 Phillips Head Screwdrivers
•Flat Head Screw Driver
•Body Clip Removal Tool
•Pliers
•Non-Marring Pick
•(2) Quick Grip Clamps
• Bar clamp (optional)
•5/16” Nut Driver
•Coolant Drain Pan
•Drill/Driver
•#2 and #3 Phillips Head Bit
•Utility Knife
•Pair of Scissors
•Shears
•Grease
•Silicone Sealant
•Teflon Tape
•Tape Measure
•China Marker or other Non-Permanent Marker
•Snips
WARNINGS, TIPS, & REQUIRED TOOLS
TOOLS REQUIRED:
GENERAL INFORMATION BEFORE YOU START
California Health and Safety Proposition 65 Warning: This product may contain chemi-
cals known to the state of California to cause cancer and birth defects or other reproductive harm.

CAB INSTALLATION
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STEP 1: (VEHICLE PREP)
1.1 If tractor is equipped with a 100LC Loader, rotate loader
valve hose loop up per figures 1.1a and 1.1b.
Tools required
22mm Wrench or Socket
1.2 Remove and position the loader (if installed) away from
the vehicle.
1.3 Remove and set aside the ROPS mounted tool box and
bracket along with its fasteners, if equipped. See fig. 1.3
Tools required
12mm Wrench or Socket
1.4 Remove and set aside the SMV sign and its bracket.
See Figures 1.4.
Tools required
13mm Wrench and Socket
1.5 Remove outside ROPS hardware found on both sides of
the tractor and set aside. See figure 1.5.
Tools required
19mm Wrench or Socket
1.6 Remove tail lights from factory mounts per figure 1.6.
Note: you do not need to disconnect the lights.
Tools required
17mm Wrench or Socket
Fig. 1.3 (Remove ROPS mounted Tool Box)
Fig. 1.1a & 1.1b (Rotate Hose Loop)
Rotate Loop
Up
To Here
Fig. 1.5 (Outboard ROPS Fasteners)
Remove outside
ROPS Hardware
Fig. 1.6 (Tail Lights)
Slide light backwards
from mounts
Fig. 1.4 (Remove SMV Sign Bracket)
Remove + Set Aside

CAB INSTALLATION
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STEP 1: (VEHICLE PREP
CONTINUED)
1.7 Pop the hood, disconnect the headlights per figure 1.7.
1.8 If Grill Guard is installed, remove and set aside with
mounting hardware per figure 1.8.
Tools required
19mm Wrench or Socket
1.9 Remove grill and side panels (all one piece) from
tractor.
Tools required
12mm Wrench or Socket
1.10 Following the manufacturer’s instructions, remove the
access panel under the dash and disconnect the
battery.
1.11 Locate the fuse harness (WH-GF) in the hardware box.
Make certain the fuse is installed in the fuse holder.
Install the ring terminal of the fuse harness to the
alternator. See Figure 1.11.
1.12 Reconnect battery and reinstall the access panel.
1.13 Install loader lock lever extension bracket onto factory
lever. See Figure 1.13.
Hardware Used Qty
#10-32 X 1/2” Flange Hex Head Screw 1
Tools required
5/16” Wrenches
Note: If installing optional seal kit (9SK8), or Adaptor Kit to
Mount Cab without Loader (1NHWM25SAK), install
now.
Fig. 1.13 (Install Lock Lever Ext Bracket)
Factory Lever
Fig. 1.7 (Disconnect Head Light, Left Side Shown)
Disconnect
Light Here
Fig. 1.8 (Remove Grill Guard)
Fig. 1.11 (Fuse Harness Instalation)
Fuse Holder
Alt Power

CAB INSTALLATION
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STEP 2: (REAR MOUNT BRACKETS)
2.1 Using the fasteners listed below and those that were
removed during step 1.4, first install the spacers and
then the rear mount bracket on the left side of vehicle
with the small flange facing up. See Figure 2.1.
Hardware Used Qty
1/2” ID X 3/4” OD X 5/32” THK Spacer 2
Tools required
17mm Wrench or Socket
2.2 Install lower left mount per Figure 2.2.
Hardware Used Qty
5/16-18 X 3/4 Hex Head Screw 2
5/16-18 Hex Nut 2
Tools required
1/2” Wrench and Socket
2.3 Install left tail light on rear mount bracket, removed
during step 1.5. See Figure 2.3.
Tools required
17mm Wrench
2.4 Repeat steps 2.1 thru 2.3 on the right side of the
vehicle.
Fig. 2.1 (Rear Mount Bracket Orientation)
Fig. 2.2 (Lower Rear Mount Orientation)
Fig. 2.3 (Re-Install Tail Light)
Note: Red on back
lower half of tail light.
STEP 3: (ROPS BRACKETS AND
CLAMPS)
3.1 Measure down from the tab found on the ROPS
Structure approximately 7/8”. Make a mark using a
china marker or other non-permanent marker. Install the
left ROPS bracket and clamp. See Figure 3.1.
Hardware Used Qty
5/16-18 X 3/4 Hex Head Screw 4
5/16-18 Hex Nut 4
Tools required
1/2” Wrench and Socket
3.2 Repeat step 3.1 on the right side of the vehicle. Fig. 3.1 (ROPS Bracket and clamp, left)
ROPS Tab
7/8”

CAB INSTALLATION
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Fig. 4.3a (Cowl)
STEP 4: (RADIATOR SHROUD, LOAD
LOCK LEVER & COWL)
4.1 Position the radiator shroud on the vehicle just in front
of the front lip of the floorboard per figure 4.1. Install Tip:
If needed, move the rubber boot of the jockstick out of
the way when placing the shroud in place. Place the
boot back in place once shroud is placed.
4.2 Install Thumb Screw into previously installed Load Lock
Lever Extension bracket (Step 1.10). Make sure there
is enough thread on the inside for a hex nut to fit. Then
thread and tighten on the hex nut on the inside. See
Figures 4.2a and 4.2b.
Hardware Used Qty
Thumb Screw, 3 inches long 1
#10-32 Hex Nut 1
Tools required
3/8” Wrench or Socket
4.3 Install steel cowl in front of radiator shroud per figure
4.3a. For best seal, make sure that rubber running
across the top of the dashboard (between the white
arrows) is pushed back and pushed forward as it runs
down the side of the dash (outside the white arrows) as
shown in figure 4.3b.
Hardware Used Qty
1/4-20 Thumb Nut 5
Fig. 4.1 (Radiator Shroud, Right)
Lip of floorboard
Boot
Fig. 4.3b (Cowl Rubber)
Push rubber back towards
steering wheel between
the white arrows.
Figure 4.2a (Load Lock Lever, Cab inside)
Figure 4.2b (Load Lock Lever, Cab outside)
#10-32 Hex Nut

CAB INSTALLATION
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STEP 5: (REAR LEGS)
5.1 Fasten the rear leg to the previously installed ROPS
brackets. See Figure 5.1.
Hardware Used Qty
5/16-18 X 3/4 Hex Head Screw 2
5/16-18 Hex Lock Nut 2
Tools required
1/2” Wrench and Socket
5.2 Repeat step 5.1 on the right side of vehicle.
Fig. 7.2a (Side Frame)
5/16-18 x
3/4 Screws
5/16-18
Nuts
1/4-20
Thumb
Nuts
Fig. 5.1 (Rear Leg to Side Frame Fasteners)
5/16-18 x 3/4 Screws
5/16-18 Nuts
STEP 6: (LOWER FRONT MOUNTS)
6.1 Install left side lower front mount using supplied
hardware listed below. See Figure 6.1. Note: If
backhoe or No-Loader Adapter Kit is installed, 1/2”
spacers are not required.
Hardware Used Qty
M12x1.75 X 55 Hex Head Screw 2
M12 Washer 2
M12x1.75 Flange Hex Nut 2
1/2” ID X 3/4” OD X 1/2” THK Spacer 2
Tools required
19mm Wrench and Socket
6.2 Repeat step 6.1 on the right side of vehicle.
Fig. 6.1 (Lower Front Mount, Left)
M12 Washer
STEP 7: (SIDE FRAMES)
7.1 With assistance, remove the pre-assembled left door
from the left side frame and set aside. Do not lose the
brass washers on the hinge pins.
7.2 Fasten the left side frame to the left Front Mount,
Radiator Shroud, and Rear Leg. See Figures 7.2a and
7.2b.
Hardware Used Qty
5/16-18 X 3/4 Hex Head Screw 5
5/16-18 X 1 Button Head Screw 2
5/16-18 Flat Washer 2
5/16-18 Hex Nut 2
1/4-20 Thumb Nut 1
Tools Required
1/2” Wrench or Socket
3/16” Allen Wrench
Fig. 7.2b (Side Frame, Detail View)
5/16-18 Button
Head Screws
5/16 Washers
Lower Front Mount
Spacer Behind Lower
Front Mount

CAB INSTALLATION
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STEP 7: (SIDE FRAMES CONT’D)
7.3 Fasten the side frame to the cowl as shown in Fig-
ure 7.3.
Hardware Used Qty
5/16-18 X 3/4 Hex Head Screw 2
5/16-18 Hex Nut 2
Tools required
1/2” Wrench and Socket
7.4 Repeat steps 7.1 thru 7.3 on the right side of the
vehicle.
STEP 8: (WINDSHIELD SUPPORT)
8.1 With assistance, align sides and top of the windshield
support with the side frames. Fasten the windshield
support in place with a screw through the front of each
side frame. See Figure 8.1. Confirm bolt holes in the top
of the windshield support align with the inserts in the
side frames and tighten hardware.
Hardware Used Qty
5/16-18 X 3/4 Hex Head Screw 2
Tools required
1/2” Wrench or Socket
Fig. 8.1 (Windshield Support to Side Frame Fasteners)
5/16-18 x 3/4 Screws
Fig. 9.1 (Lower Rear Panel)
1/4-20 Nut
STEP 9: (LOWER REAR PANEL)
9.1 Fasten the lower rear panel to the rear legs as shown in
Figure 9.1.
Hardware Used Qty
1/4-20 X 5/8 Hex Head Screw 4
1/4-20 Flange Hex Nut 4
Tools required
3/8” Wrench and Socket
7/16” Wrench and Socket
Note: On backhoe equipped vehicles, the lower rear panel
will need to be removed to operate the backhoe. It is up
to the discretion of the operator whether or not to
reinstall.
5/16-18 x 3/4 Screws
5/16-18 Nuts
Fig. 7.3 (Side Frame to Cowl Fasteners)
1/4-20 x 5/8 Screws

CAB INSTALLATION
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Fig. 10.1 (Attach Main Harness To Cowl)
Fig. 10.3 (Secure Harness to Side Frame)
STEP 10: (CAB WIRING)
10.1 Attach the main power wire harness to the top of the
cowl, about 6” from the end of the windshield wiper
motor connector, using supplied zip-ties. The connector
end should be outside the cab with the rest of the
harness on the inside. See Figure 10.1.
Hardware Used Qty
11” Long Zip-Tie 3
10.2 Snap the heater switch into the rectangular cutout in the
top of the cowl and connect the wire harness.
10.3 Run the wire harness over to and down the left side
frame through the gap between the floorboard and
intake shroud. Secure it in (2) places along the side
frame using P-clamps and self-drilling screws. See
Figure 10.3.
Hardware Used Qty
#10 x 3/4” Pan Head Self-Drill Screw 2
P-Clamps 2
Tools required
#2 Phillips Bit
Drill/driver
10.4 Run the harness to the alternator as shown in Figures
10.4 and 10.5 making sure that wires will not be cut or
pinched passing by the radiator or moving parts.
10.5 Locate the fuse harness (WH-GF) and connect the fuse
harness to the main power harness via the bullet
connectors. See Figure 10.5.
10.6 Install the ring terminal of the main power wire harness
to the vehicle’s engine. Coil the slack in the power
harness and secure with a wire tie. See Figure 10.5.
Double check that the wires are not pinched or near
sharp or hot surfaces.
NOTE: At the installer’s discretion, wiring for
accessories may also be installed into the engine
compartment at this time.
10.7 Secure wires (with wire ties provided) away from any
hot or moving engine components where it could melt or
be pinched.
Fig. 10.5 (Power Harness Connections)
Fuse Holder
Power
Harness
Ground
Wire Ties
P-Clamps
Fig. 10.4 (Power Harness to Hood)
Alt Power
Heater Switch Wiper Connector
End
FB & SHROUD GAP HERE
FB & SHROUD
GAP HERE
Towards
Alternator