John Deere約翰迪爾強(qiáng)鹿柴油機(jī)風(fēng)扇張緊輪與風(fēng)扇驅(qū)動(dòng)組件拆卸和檢查

IMPORTANT: Belt tensioner cap screw (A) is left-hand

threaded.

1. Release tension on belts using a breaker bar and

socket.

2. Remove poly-vee belts from pulleys.

3. Remove belt tensioner.

A—Belt Tensioner Cap Screw

4. Inspect sheave (B).

IMPORTANT: If belt tensioner mounting plate was

removed, tighten cap screws to timing

gear cover first and then tighten cap

screws to engine.

5. Install belt tensioner and tighten cap screws to

specifications.

Specification

Belt Tensioner-to-Timing Cover

and Engine Cap Screws—Torque................................... 50 N•m (37 lb-ft)

Belt Tensioner Pulley Cap

Screw—Torque................................................................ 40 N•m (29 lb-ft)

6. Install poly-vee belts. Be sure that belt is correctly

seated in all pulley grooves.

Checking Belt Tensioner Spring Tension and

Belt Wear

Belt drive systems equipped with automatic (spring) belt

tensioners cannot be adjusted or repaired. The automatic

belt tensioner is designed to maintain proper belt tension

over the life of the belt. If tensioner spring tension is not

within specification, replace tensioner.

Checking Belt Wear

The belt tensioner is designed to operate within the limit

of arm movement provided by the cast stops (A and B)

when correct belt length and geometry are used.

1. Visually inspect cast stops (A and B) on belt tensioner

assembly.

2. If the tensioner stop on swing arm (C) is hitting the

fixed stop (B), check mounting brackets (alternator, belt

tensioner, etc.) and the belt length. Replace belt as

needed.

Checking Tensioner Spring Tension

A belt tension gauge will not give an accurate measure of

the belt tension when automatic spring tensioner is used.

Measure tensioner spring tension using a torque wrench

and procedure outlined below:

1. Release tension on belt using a breaker bar and

socket on tension arm. Remove belt from pulleys.

2. Release tension on tension arm and remove breaker

bar.

3. Put a mark (A) on swing arm of tensioner as shown.

4. Measure 21 mm (0.83 in.) from (A) and put a mark (B)

on tensioner mounting base.

5. Install torque wrench (C) so that it is aligned with

center of pulley and tensioner. Rotate the swing arm

with the torque wrench until marks (A and B) are

aligned.

6. Record torque wrench measurement and compare with

specification below. Replace tensioner assembly as

required.

Specification

Belt Tensioner—Spring Tension ...................... 18—22 N•m (13—16 lb-ft)

NOTE: Threads on belt tensioner roller cap screw are

LEFT-HAND threads.

A—Mark On Swing Arm

B—Mark On Tensioner Mounting Base

C—Torque Wrench

Manual Belt Tensioner Adjustment Using

Belt Tension Gauge

A—Belt Tension Gauge

B—Cap Screw

C—Cap Screw

D—Tensioner Bracket

NOTE: Two types of manual tensioners shown.

Inspect belts for cracks, fraying, or stretched-out areas.

Replace if necessary.

As a reference check, twist belt in the middle of a 254—

305 mm (10—12 in.) span with two fingers. A properly

tensioned belt will turn 75—85 degrees. If belt turns more,

it needs to be tightened. If belt turns less, it needs to be

loosened.

NOTE: If timing gear cover or alternator bracket interfere

with installation/centering of belt tension gauge

(A), install gauge with face toward engine.

1. Install JDG1341 Belt Tension Gauge (A) on belt,

halfway between pulleys as shown.

2. Loosen cap screws (B) and (C).

3. Slide alternator or tensioner bracket (D) in slot by hand

to remove all excess slack in belt.

IMPORTANT: Do not pry against alternator rear frame.

4. Stretch belt by prying outward on alternator front frame

or tensioner bracket. Observing tension gauge, stretch

the belt until specified tension is achieved.

8-Rib Poly-Vee Belt—Specification

New Belt—Tension................................. 470—650 N (105—145 lb-force)

Used Belt—Tension.................................. 400—580 N (90—130 lb-force)

5. Tighten cap screws (B) and (C).

NOTE: After ten minutes run-in, new belts are considered

used. Belt tension must then be rechecked per

used belt specifications.

6. Run engine for ten minutes and immediately re-check

belt tension per used belt specification above.

7. Reset belt tension as necessary.

Manual Belt Tensioner Adjustment Using

Belt Tension Tool (Alternate Method for

Engines without Auxiliary Drive.)

A—Upper Alternator Bracket Cap Screw

B—Lower Alternator Bracket Cap Screw

C—JDG1520 Belt Tensioning Tool

D—Belt

NOTE: The JDG1520 Belt Tension Tool may not be

compatible with all alternators. In that case, use

the preceeding method for belt tensioning.

NOTE: Inspect belts for cracks, fraying, or stretched-out

areas. Replace if necessary.

As a reference check, twist belt in the middle of a

254—305 mm (10—12 in.) span with two fingers.

A properly tensioned belt will turn 75—85

degrees. If belt turns more, it needs to be

tightened. If belt turns less, it needs to be

loosened.

1. Loosen upper (A) and lower (B) alternator bracket cap

screws. Lower cap screw must remain tight enough to

prevent excessive alternator play but allow alternator to

pivot by hand.

2. Insert JDG1520 Belt Tensioning Tool (C) behind belt

(D) and over lower alternator mounting screw.

3. Place torque wrench (C) on belt tensioning tool (B) at

90° to tool. Pivot alternator (A) until desired torque is

achieved according to specification using the following

table.

8-Rib Poly-Vee Belt—Specification

New Belt—Tension................................. 470—650 N (105—145 lb-force)

Used Belt—Tension.................................. 400—580 N (90—130 lb-force)

JDG1520 Belt Tensioning Tool Torque Table

Desired Belt Tension Applied Torque

N (lb-force) N •m (lb-ft)

445 (100) 108 (80)

489 (110) 115 (85)

534 (120) 122 (90)

623 (140) 135 (100)

4. While holding tension with torque wrench, scribe a

reference mark (D) on alternator in line with notch (E)

on upper alternator bracket.

5. Continue to hold tension with torque wrench and

tighten upper alternator bracket cap screw.

6. Check position of reference mark to see if alternator

moved while tightening. If alternator moved, loosen

upper alternator bracket cap screw and repeat the

tension adjustment procedure.

7. Remove belt tension tool and tighten lower alternator

bracket cap screw.

A—Alternator

B—Belt Tensioning Tool

C—Torque Wrench

D—Reference Mark

E—Alternator Upper Bracket Notch

Inspect and Install Fan Assembly

Several fan drive ratios are available, allowing a closer

matching of fan speed to application.

1. Inspect fan blades for bent or damaged condition. Bent

blades reduce cooling system efficiency and throw the

fan out of balance. Replace fan if blades are bent or

damaged.

NOTE: Engines may be equipped with either suction-type

fan or a blower-type fan, depending on

application. Take care not to install fan incorrectly.

Refer to illustrations to identify fan type and

corresponding installation.

2. Install fan on pulley or pulley hub.

Install blower-type fan with concave side of blade

toward radiator.

Install suction-type fan with concave side of blade

toward engine.

Tighten cap screws (with lock washers) to

specifications.

Specification

Fan-to-Pulley Hub M8 Cap

Screws—Torque.............................................................. 35 N•m (26 lb-ft)

Fan-to-Pulley Hub M10 Cap

Screws—Torque.............................................................. 70 N•m (52 lb-ft)

John Deere約翰迪爾強(qiáng)鹿柴油機(jī)風(fēng)扇驅(qū)動(dòng)組件拆卸和檢查

Remove and Inspect Fan Drive Assembly

Fan assemblies can be mounted in several positions to

accommodate different application and engine cooling

requirements.

1. Remove fan.

2. Release tension on belt and remove poly-vee belt from

pulleys.

3. Remove fan pulley (A).

4. Inspect pulley and grooves

5. Check run-out of fan hub (C) using a dial indicator on

outer face of hub. If run-out exceeds specification,

replace fan drive assembly.

Specification

Fan Drive Hub—Radial Runout.............................. 0.038 mm (0.0015 in.)

NOTE: Cap screw position (B) is used as an example

only. Position of fan drive varies by application.

6. Mark cap screw positions (B) on timing gear cover

before removal to ensure that fan pulley is installed in

same position as removed. This will ensure proper belt

tension is achieved.

7. Remove hub (C) and fan drive.

A—Fan Pulley

B—Fan Drive Cap Screw Position

C—Hub

Replace Bearings in Adjustable Fan Drive Assembly

A—Bearing Housing D—Hub F—Cap Screw H—Idler Pulley

B—Bearing/Shaft E—Pulley G—Sleeve I—Spacer

C—Snap Ring

Disassemble Fan Drive Assembly

NOTE: Some parts in illustration above may not be

available separately for service. See parts

catalog for service parts/assemblies.

1. Support back side of fan hub (D) and press nose of

bearing/shaft (B) out of hub.

2. Remove snap ring (C) from front bore of bearing

housing (A).

3. Support front nose of bearing housing and press

bearing/shaft out of housing. Discard bearing.

4. Remove parts (F—I) if required.

5. Thoroughly clean and inspect fan hub, bearing

housing and idler pulley for cracks or any other

damage.

6. Measure parts and compare with specifications

given. Replace parts not within specifications.

Fan Drive (Option Codes 2301 and 2302)—Specification

Bearing Housing—ID 38.018—38.038 mm

(1.4968—1.4976 in.)

..........................................

Bearing—OD 38.087—38.100 mm

(1.4995—1.5000 in.)

.......................................................

Shaft—OD 18.948—18.961 mm

(0.7460—0.7465 in.)

...........................................................

Hub—ID 18.910—18.936 mm

(0.7445—0.7455 in.)

..............................................................

Fan Drive (Option Codes 2303, 2304, 2312, 2313, 2314, 2321 and

2341)—Specification

Bearing Housing—ID 47.573—47.599 mm

(1.8730—1.8740 in.)

..........................................

Bearing—OD 47.612—47.625 mm

(1.8745—1.8750 in.)

.......................................................

Shaft—OD 25.387—25.400 mm

(0.9995—1.0000 in.)

...........................................................

Hub—ID 25.337—25.353 mm

(0.9975—0.9985 in.)

Assemble Fan Drive Assembly

1. Support rear face of bearing housing and drive bearing

into housing by pressing on outer bearing shell until

bearing bottoms in housing bore.

2. Install internal snap ring into front groove of housing

bore.

3. Support shaft through rear housing bore and press fan

hub onto shaft to dimension (A).

Fan Drive—Specification

Rear Housing Face-to-Hub Front

Face (Option Codes 2301 and

2303)—Distance 110.85—110.87 mm

(4.364—4.365 in.)

........................................................

Rear Housing Face-to-Hub Front

Face (Option Codes 2302, 2304,

2312, 2313 and 2314)—Distance 106.65—106.67 mm

(4.199—4.200 in.)

4. If idler pulley was removed, reinstall according to

following table:

Fan Pulley Fan Height Idler Position

168 mm (6.61 in.) 210 mm (8.27 in.) B

140 mm (5.51 in.) 210 mm (8.27 in.) A

203.2 mm (8.0 in.) 226 mm (8.9 in.) B

168 mm (6.61 in.) 226 mm (8.9 in.) B

140 mm (5.51 in.) 226 mm (8.9 in.) A

203.2 mm (8.0 in.) 258 mm (10.16 in) B

168 mm (6.61 in.) 258 mm (10.16 in) B

140 mm (5.51 in.) 258 mm (10.16 in) A

203.2 mm (8.0 in.) 290 mm (11.42 in.) B

168 mm (6.61 in.) 290 mm (11.42 in.) B

140 mm (5.51 in.) 290 mm (11.42 in.) A

203.2 mm (8.0 in.) 402 mm (15.83 in.) D

168 mm (6.61 in.) 402 mm (15.83 in.) C

140 mm (5.51 in.) 402 mm (15.83 in.) C

5. Torque idler retaining cap screw to specification.

Specification

Fan Drive Idler Cap Screw—

Torque ............................................................................. 50 N•m (37 lb-ft)

Replace Bearings in Heavy-Duty, Adjustable Fan Drive Assembly

A—Plug E—Snap Ring H—Washer K—Sleeve

B—Bearing Housing F—Seal I—Cap Screw L—Idler Pulley

C—Bearing G—Hub J—Cap Screw M—Spacer

D—Shaft

Disassemble Fan Drive Assembly

NOTE: See parts catalog for service parts/assemblies.

1. Clamp fan hub (G) in a soft-jawed vise. Support fan

drive housing (so it does not fall to floor), and

remove cap screw (I) and washer (H) securing hub

to shaft (D). Remove fan hub from shaft.

2. Remove and discard grease seal (F) and snap ring

(E)

3. Remove plug (A) from rear bore of bearing housing.

4. Remove shaft with bearings (C) by lightly tapping

with a rubber mallet or brass hammer.

5. Remove bearings from shaft using a press and

discard bearings.

6. Thoroughly clean and inspect shaft and bearing

housing (B) for cracks or any other damage.

7. Measure parts and compare with specifications

given. Replace parts not within specifications.

Fan Drive (Option Codes 2309 and 2311)—Specification

Bearing Housing—ID 72.005—72.031 mm

(2.8348—2.8359 in.)

..........................................

Bearing—OD 71.987—72.013 mm

(2.8341—2.8351 in.)

.......................................................

Shaft—OD 30.218—30.234 mm

(1.1897—1.1903 in.)

...........................................................

Hub—ID 30.159—30.185 mm

(1.1874—1.1884 in.)

A—Plug E—Snap Ring H—Washer K—Sleeve

B—Bearing Housing F—Seal I—Cap Screw L—Idler Pulley

C—Bearing G—Hub J—Cap Screw M—Spacer

D—Shaft

Assemble Fan Drive Assembly

1. Pack inner and outer bearings (C) with TY6333 or

TY6347 High Temperature Grease. Apply clean

engine oil to bearing I.D. and shaft O.D.

IMPORTANT: Apply force to bearing inner race

only.

2. Support end of shaft (D) and install bearings

against shoulder.

3. Support bearing housing (B) on a firm flat surface

with bearing bore in the upward position.

4. Install bearing and shaft assembly into housing.

5. Determine proper snap ring (E) thickness needed to

obtain specified end play.

Specification

Fan Drive Shaft—Max. End

Play .................................................................... 0.25 mm (0.0098 in.)

6. Install snap ring in housing groove. Visually inspect

snap ring installation for proper seating in housing

groove.

7. Apply a thin coat of clean engine oil to O.D. of seal

(F) and to seal lips. Install seal in housing bore until

flush with housing.

8. Install plug (A) in rear of housing to specified height

above housing face.

Specification

Fan Drive Housing Plug—

Height 5.9—6.5 mm (0.2323—0.2559

in.)

..................................................

9. Apply clean engine oil to I.D. of fan hub (G) and

push onto shaft until it bottoms against shoulder.

10. Install washer (H) and cap screw (I). Tighten cap

screw to specifications.

Specification

Fan Hub-to-Fan Shaft—Torque.............................. 125 N•m (92 lb-ft)

11. Install idler pulley if removed. Torque idler

retaining cap screw to specification.

Specification

Fan Drive Idler Cap Screw—

Torque....................................................................... 50 N•m (37 lb-ft)

Install Fan Drive Assembly

IMPORTANT: Be sure adjustable fan drive assembly

is installed in correct position as

removed to ensure proper belt tension.

1. For engines using poly-vee belts: If reference marks

were not made on timing gear cover during removal of

fan drive assembly, use the following table to

determine proper fan height.

POLY-VEE BELT (MANUAL TENSIONER)

4.5 L Fan Belt Fan Height 6.8 L Fan Belt

Option Option

290 mm (11.42 in.) W/Idler Pulley (A)

240A, 240B, 240C, 24BK

240D

338 mm (13.31 in.) (A)

240E 240F

402 mm (15.83 in.) (A)

240G, 240H, 240J, 240K

2. For engines using poly-rib-belts: If reference marks

were not made on timing gear cover during removal of

fan drive assembly, use figure to the right and following

table to determine proper fan height.

POLY-RIB BELT

4.5 L Fan Belt Fan Height 6.8 L Fan Belt

Option Option

210 mm (8.27 in.) W/Idler Pulley (A)

24AG, 24AH, 24AJ, 24AJ, 24AN

24AK, 24AL, 24AM

226 mm (8.9 in.) W/Idler Pulley (A)

2406, 2408, 2415, 2401, 2402, 2403,

2435, 2436, 2461, 2405, 2407, 2412,

240P, 240Q 2471, 2472, 2473,

2474, 240T, 240W

258 mm (10.16 in.) W/Idler Pulley (A)

24AR, 24AT 24BT

290 mm (11.42 in.) W/Idler Pulley (A)

2404, 2407, 2409, 2409, 2411, 2413,

2410, 2411, 2412, 2414, 2415, 2435,

2437, 2439, 2440, 2438, 2475, 2476,

2458, 2459, 2460, 240R, 240S, 240V

2462, 240U

338 mm (13.31 in.) (B)

2416, 2417, 2419, 2416, 2418, 2420,

2420, 2421, 2423, 2421, 2422, 2423,

2424, 2442, 2443, 2424, 2441, 2477,

2463, 2466, 2468 2478, 2479, 2482

402 mm (15.83 in.) (B)

2426, 2428, 2430, 2417, 2419, 2425,

2431, 2432, 2444, 2427, 2429, 2480

2445, 2464, 2465,

2469, 2470

402 mm (15.83 in.) W/Idler Pulley (C)

2434, 2446 2433

A—Fan Height Distance

B—Fan Height Distance

C—Fan Height Distance

ALT—Alternator

CP—Crank Pulley

ACC—Air Conditioning Compressor

FD—Fan Drive

I—Idler

T—Tensioner

WP—Coolant Pump

NOTE: Cap screw position (A) is used as an example

only. Position of fan drive varies by application.

3. Install hub (C) with fan drive assembly, in positions (A)

marked during disassembly, and tighten cap screws to

specifications.

Specification

Fan Drive Assembly-to-Timing

Cover Cap Screws—Torque ........................................... 70 N•m (52 lb-ft)

A—Cap Screw Position

C—Fan Drive Hub

4. Install fan pulley (C) and tighten cap screws to

specifications.

Specification

Fan Pulley-to-Pulley Hub M8 Cap

Screws—Torque.............................................................. 35 N•m (26 lb-ft)

Fan Pulley-to-Pulley Hub M10

Cap Screws—Torque ...................................................... 70 N•m (52 lb-ft)

5. Install poly-vee belt. Be sure belt is correctly seated in

all pulley grooves.

C—Fan Pulley

John Deere約翰迪爾強(qiáng)鹿柴油機(jī)拆卸和安裝風(fēng)扇驅(qū)動(dòng)組件

1. Remove parts (A—E) and (H—N) as required.

2. Inspect and replace parts as necessary.

3. Press bearing shaft (A) into fan bracket (B) until

bearing face is flush with bracket end face.

4. Place fan bracket under a press so that the thrust,

when pressing on pulley, is received only by the

bearing shaft end (F). Press pulley until distance (G) is

obtained.

Specification

Rear Housing Face-to-Hub Front

Face—Distance ........................................................ 123.5 mm (4.862 in.)

5. Install fan bracket on engine and tighten hardware to

specifications.

Fan Drive Assembly (2254 Combine)—Specification

Fan Idler Axle Shaft-to-Block

(D)—Torque................................................................. 340 N•m (251 lb-ft)

Fan Idler-to-Shaft Retaining Nut

(J)—Torque.................................................................. 225 N•m (166 lb-ft)

Fan Drive Bracket-to-Block Cap

Screw (K)—Torque...................................................... 340 N•m (251 lb-ft)

Fan Drive Bracket-to-Cylinder

Head Cap Screws (M)—Torque.................................. 140 N•m (103 lb-ft)

Upper Fan Drive

Bracket-to-Lower Bracket Cap

Screws/Nuts (L)—Torque............................................ 140 N•m (103 lb-ft)

A—Bearing Shaft

B—Fan Bracket

C—Pulley

D—Idler Axle Shaft

E—Idler

F—Bearing Shaft End

G—Distance for Pulley Installation

H—Spacer

J—Nut

K—Screw

L—Nut

M—Cap Screw

N—Spacer

Remove and Install Coolant Heater (If

Equipped)

A—Cord

B—Dust Cover

C—Retaining Nut

D—Adapter

E—Gasket

F—O-Ring

G—Heater Element

CAUTION: To avoid shock or hazardous

operation, always use a three-wire heavy-duty

electrical cord equipped with three-wire

connectors. If a two-to-three contact adapter is

used at the wall receptacle, always connect

green wire to a good ground. Keep electrical

connectors clean to prevent arcing. Only plug

coolant heater into electrical power if heating

element is immersed in coolant. Sheath could

burst and result in personal injury.

1. Unplug heater from electrical power source.

2. Drain cooling system.

3. Disconnect cord (A) from heater assembly.

4. Loosen retaining nut (C) and remove adapter (D) and

heater element from block.

5. Inspect and replace parts as necessary.

NOTE: The heater element (G) cannot be repaired.

Replace if defective.

6. Install a new gasket (E). Apply JDT308 Soap Lubricant

to new O-ring (F) and install.

7. Install heater element through adapter (D) and install

nut (C) loosely.

8. Install heater into cylinder block with element pointing

to the rear.

9. Tighten adapter (D).

10. Turn element clockwise and then counterclockwise

until element contacts casting. Move element midway

between contact points.

11. Hold element with a wrench and tighten retaining nut

(C) to specifications.

Specification

Coolant Heater Lock Nut—Torque.................................. 35 N•m (26 lb-ft)

NOTE: If heater has been ordered as an attachment only,

it will include a dust cover (B). The cover is used

to protect the electrical connectors when cord

assembly (A) has been removed.

12. Install cord.

13. Service engine with coolant.