INSTALLA TIO N & OWNER 'S MANU AL

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INSTALLATION & OWNER

’S MANUAL

Kubota BX80 Heater

(p/n: 9PH20S72)

fits tractor models: BX1880, 2380, and 2680

(*=Not including accessories)

Rev. A, 04/11/2022

P/N: IM-9PH20S72

The contents of this envelope are the property of the owner. Leave with the owner when installation is complete.

Approximate Installation Time *

Experienced Dealer Technician – 2 Hours

Average Dealer Technician – 3 Hours

Do-It-Yourself – 4 Hours

HEATER INSTALLATION

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These instructions assume cab installation is already

complete. If installing heater at the same time as cab,

follow cab instructions.

STEP 1: (Mounting and wiring)

1.1 Remove hardware already in place and attach the

heater bracket to the right A-Pillar with it. See Figure 1.1.

Tighten hardware.

Tools required

½” wrench or socket

1.2 Attach the heater to the heater bracket using the screws

already installed on the side of the heater. Note that only

the bottom 2 screws are installed on cabs with vinyl

hinged doors. The top screws will be installed in a later

step. See Figure 1.2. Tighten hardware.

Tools needed

#2 Phillips Screw driver.

1.3 See fig. 1.3. Push the switch connector up through the

rectangular hole in the cowl, connect to the switch and

snap in the heater switch. The “off” position for this

switch is in the middle, with low speed one way and

high speed the other way. The switch may be installed

in either direction, and can be removed and rotated

180° later if desired.

1.4 Connect the heater bullet connectors to the wiring

harness, matching wire colors. Cover the exposed wires

with 1/2” split loom provided.

Fig. 1.1 (Install Heater Bracket to A-PIllar)

5/16-18 x 1-1/2” Screws

5/8” Long Spacers

Fig. 1.2 (Install Heater)

Screws from

Heater

Cabs with vinyl hinged

doors: install upper screws

later with striker bracket

Fig. 1.3 (Install Switch)

Switch

HEATER INSTALLATION

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Fig. 2.2 (Snap Rings and Heater Hose)

Fig. 2.3 (90° Heater Hose Elbow and Trim Lok)

Trim Lok

90° Elbows

Hose Clamp

STEP 2: (HEATER PLUMBING)

* CAUTION * To avoid injury caused by hot engine cool-

ant, make sure the engine is completely cooled down

before beginning plumbing of auxiliary heater.

2.1 Drain the engine coolant into a clean container so that it

may be reused.

2.2 From outside the cab, remove both dome plugs, and

install both ¾” snap bushings into the large holes in the

right A-pillar floor board. Feed both ends of the 5/8”

diameter hose through the bushings to the inside of the

cab, connect them to the nipples on the heater, and

secure them with 1” hose clamps. See Figure 2.2.

2.3 Make sure the heater hose is not too tight or kinked

before going through the snap rings, and cut both ends

of hose about 1” beyond the snap rings on the outside.

Connect the 90° heater hose elbows and secure with 1”

hose clamps. Attach 6” of Trim Lok to the bottom edge

of the vehicle floor board. See Figure 2.3.

2.4 Locate the lower coolant hose on the right side of the

engine. See Figure 2.4. Cut the lower hose between

the two 90° bends as shown and let any remaining cool-

ant drain into a clean drain pan.

2.5 Place the two 1.5” hose clamps on either side of the cut

lower hose and install the T-Fitting pointing down. See

Figure 2.5. Tighten the hose clamps.

2.6 Unbolt the thermostat housing and remove the thermo-

stat and gasket. See Figure 2.6. Save the thermostat

for re-installation, but discard the gasket and bolts.

Snap Rings from Outside

Hose Clamp

Heater Hose

Figure 2.4 (Right Side of Engine Bay)

Upper Hose

Lower

Hose

Cut Here

Thermostat

Housing

T-Fitting

Figure 2.5 (Install T-Fitting in Lower Hose)

Figure 2.6 (Remove Thermostat)

Gasket

Thermostat

HEATER INSTALLATION

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STEP 2: (HEATER PLUMBING

CONTINUED)

2.7 Pre-install the 3/8” NPT Nipple into the thermostat

spacer using Teflon tape. Install the thermostat spacer

onto the engine using a new gasket provided, followed

by the thermostat, another new gasket, and the

thermostat housing with new longer bolts. Ensure that

the nipple is pointing towards the front left of the vehicle.

See Figure 2.7.

2.8 See fig. 2.8. Connect 5/8” hose to the 3/8” NPT Nipple

on the thermostat spacer and secure it with 1” hose

clamp. Run the hose around the front of the engine,

down past the alternator, and between the right floor

board and front loader frame. See Figure 2.8. Roughly

run the end of the hose to the 90° elbows and cut the

rest of the hose off.

2.9 Connect the 5/8” hose to the T-Fitting and secure it with

a 1” hose clamp. Run the hose along next to the

previously run hose in step 2.8.

2.10 Pre-install the mesh sleeve onto the two hoses and then

trim the hoses to length and connect them to the 90°

elbows, securing them with 1” hose clamps. See Figure

2.10.

2.11 Slide the mesh sleeve over the fittings and secure it with

a cable tie. See Figure 2.11.

2.12 Check hose and wire routing to make sure no hoses or

wires are kinked, pinched, or are rubbing against any

sharp edges. Also make sure the hoses and wires will

not interfere with hood when closing, any moving parts,

pedals on the tractor, or contact hot engine

components. Secure hoses as necessary with large

wire ties provided.

2.13 Splice into the heater supply line above the exhaust

manifold and install the in-line shut-off valve using 1”

hose clamps.

NOTE: The in-line shut-off valve quickly converts the heater

into a summer time blower by preventing hot water from

flowing to the heater core.

Gaskets

Thermostat

Spacer

Thermostat

3/8” Nipple

New Bots

Figure 2.7 (Install Thermostat Spacer)

(View from Right Side)

Figure 2.8 (Run Hose Around Engine)

(View from Right Side)

Figure 2.10 (Connect Hoses to 90° Elbows)

Figure 2.11 (Cover Hoses and Fittings with Mesh)

HEATER INSTALLATION

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SERVICE PARTS

PART NUMBER DESCRIPTION

9SV-9DPSB HEATER HOSE BUSHINGS, SNAP BUSHING, .750" X 1.093" (QTY.: 1)

8SV-9HR-00001-5 NYLON SLEEVING, 2.38" I.D., 5' LENGTH

9SV-9HR-00008 THERMOSTAT SPACER, BX80 HEATER (1 SPACER, 2 GASKETS)

9SV-9HR0039 90 DEGREE HEATER HOSE ELBOW 5/8" BARBED ENDS (QTY.: ONE)

9SV-9HR0042 1" TEE FITTING (QTY.: ONE)

9SV-9HR0045 BLOCK ADAPTER (3/8" NIPPLE) (QTY.: 2)

9SV-9HR00601.0 HOSE CLAMPS #10 (1") (QTY.: 6)

9SV-9HR00601.5 HOSE CLAMPS #16 (1.5") (QTY.: 2)

9SV-UHTRILV UNIVERSAL HEATER IN-LINE VALVE (SET OF 2)

9SV-9HR0048 ROCKER SWITCH (HI-OFF-LOW) (QTY.: ONE)

9SV-9HR-L REPLACEMENT LOUVER-15,000 & 20,000 BTU HEATER

8SV-9PH20WG TUCK-AWAY HEATER WITH WIRED GROUND

9SV-HRH61-20 HEATER HOSE (5/8" I.D.)-20 FT

9PH20-2 FAN 120 x 120 x 38 12VDC 12W 3200 RPM

TRIM LOK, STD,

1/16" - 1/8" GRIP

9SV-PRO1-10

STEP 3: (FINISH)

3.1 Refill the cooling system. Start the tractor and inspect

coolant system for leaks.

3.2 With the tractor running, check the heater hoses and

make sure they get warm. If not, remove the heater

from its mount and let hang from the hoses as low as

possible. If the heater and hoses still do not get warm,

temporarily put a clamp on the upper radiator hose to

force coolant through the heater. Warning: To avoid

engine damage, remove the clamp as soon as heater

gets warm. Reattach heater to the bracket. Once

complete, let the engine cool, check the coolant level,

and top off coolant if required.