Ransomes 67978, 67979, 67980, 67981, 67982, 67983 User manual

7

4241262-Rev B 7-1

Chapter 7

Steering

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Component Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

Tests and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Steering Linkage Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

Steering Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

Steering Tower Cover (Earlier Machines) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

Steering Tower Cover (Later Machines) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

Steering Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8

Steering Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9

Throttle Lever Assembly (Earlier Machines) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16

Throttle Lever Assembly (Later Machines) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18

Steering Tower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-20

Steering Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21

Tie Rod Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-24

Rear Axle Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-26

7-2 4241262-Rev B

STEERING

7

Specifications

Test and Adjustment Specifications

Rear Axle Alignment Toe-In Measurement in. (mm) 0.030–0.090 (0.8–2.3)

Rear Axle Steering Arm-to-Steering Stop

Measurement

in. (mm) 0.030–0.090 (0.8–2.3)

Rear Axle Assembly End Play

in. (mm) 0.010–0.060 (0.25–1.5)

Repair Specifications

Steering Wheel Nut lb-ft (N·m) 25–30 (34–41)

Steering Unit End Cover-to-Housing Screw Torque

lb-ft (N·m) 20–24 (27–33)

Throttle Arm Screw Torque

lb-in. (N·m) 100 (11.3)

Throttle Stop Carriage Bolt Torque

lb-in. (N·m) 157 (17.7)

Steering Cylinder Ball Joint-to-Steering Arm Torque

lb-ft (N·m) 80–110 (108–149)

Tie Rod Ball Joint-to-Steering Arm Torque—

2WD Cutting Units

lb-ft (N·m) 30–35 (41–47)

Tie Rod Ball Joint-to-Steering Arm Torque—

4WD Cutting Units

lb-ft (N·m) 80–110 (108–149)

Steering Arm-to-Motor Mount Screw Torque

lb-ft (N·m) 90–100 (122–136)

Rear Axle Assembly Jam Nut Torque

lb-ft (N·m) 80–110 (108–149)

STEERING

4241262-Rev B 7-3

7

Component Location

See Figure 7-1.

Figure 7-1

1 Throttle Lever 4 Steering Cylinder 7 Steering Column

2 Tilt Lever 5 Tie Rod 8 Steering Unit

3 Rear Axle Assembly 6 Steering Wheel 9 Steering Tower Cover

TN3631, TN3632, TN3585

9

8

2

5

6

7

1

3

4

7-4 4241262-Rev B

STEERING

7

Tests and Adjustments

Steering Linkage Adjustments

See Figures 7-2 through 7-5.

IMPORTANT

The following adjustments must be performed in

sequence to ensure correct steering linkage

adjustment.

Tie Rod Adjustment

NOTE

2WD steering assembly is shown; 4WD steering

assembly is similar.

1. Park the mower safely. (See “Park Mower Safely” on

page 1-6.)

2. Turn the wheels to the straight-ahead position.

Figure 7-2

3. Measure the distance between the center lines of the

tires at the front (1) and rear (3) of the tires. The

measurement (toe-in) at the front of the tires should

be 0.030–0.090 in. (0.8–2.3 mm) less than the

distance at the rear of the tires. If the toe-in does not

meet specifications, adjust as follows:

a. Loosen the tie rod jam nuts (2 and 4) on both

sides of the tie rod (5).

b. Turn the tie rod (5) as needed to obtain proper

toe-in (1).

c. Retighten the tie rod jam nuts (2 and 4).

4. Proceed to “Turn Stop Adjustment” on page 7-4.

Turn Stop Adjustment

IMPORTANT

The steering linkage must be adjusted in proper

sequence. Do not perform this procedure until the tie

rod adjustment has been performed. (See “Tie Rod

Adjustment” on page 7-4.)

NOTE

2WD steering assembly is shown; 4WD steering

assembly is similar.

1. Park the mower safely. (See “Park Mower Safely” on

page 1-6.)

2. Turn steering wheel to the left until the steering

cylinder is completely extended.

Figure 7-3

TN2952

4

1

3

2

5

TN2953

5

4

2

3

1

STEERING

4241262-Rev B 7-5

7

Figure 7-4

3. Measure the gap (3) between the left steering arm

(5) and steering stop on the rear axle (4). The

measurement should be 0.030–0.090 in. (0.8–2.3

mm). If the measurement does not meet

specifications, adjust as follows:

a. Remove cotter pin (8).

b. Remove castle nut (9), and disengage steering

cylinder (1) from the right steering arm (10).

c. Loosen clamp bolt (6) and nut (7) on steering

cylinder (1).

d. Adjust (turn) ball joint (2) in or out as needed to

obtain proper distance. Tighten steering cylinder

clamp bolt (6) and nut (7).

e. Install steering cylinder (1) and castle nut (9).

Tighten castle nut to 80–110 lb-ft (108–149 N·m).

NOTE

Install cotter pin (8) after performing turning radius (equal

angle) adjustment.

4. Proceed to “Turning Radius (Equal Angle)

Adjustment” on page 7-5.

Turning Radius (Equal Angle) Adjustment

IMPORTANT

The steering linkage must be adjusted in proper

sequence. Do not perform this procedure until the tie

rod and turn stop adjustments have been performed.

(See “Tie Rod Adjustment” on page 7-4 and “Turn

Stop Adjustment” on page 7-4.)

NOTE

2WD steering assembly is shown; 4WD steering

assembly is similar.

1. Check the turning radius by driving the mower in a

circle in both a hard right and a hard left turn.

2. Measure the diameters of the tire track circles.

3. Park the mower safely. (See “Park Mower Safely” on

page 1-6.)

4. Turn the wheels to the straight-ahead position.

5. Check that ball joints are threaded equally into both

ends of steering cylinder.

Figure 7-5

6. Remove cotter pins (1 and 6) and castle nuts (2 and

7), and disengage steering cylinder (8) from the right

steering arm (12) and rear axle (9).

7. Loosen clamp bolts (4 and 10) and nuts (5 and 11)

on steering cylinder (8).

TN2954

9

8

10

2

4

6 7

1

TN2954

7

6

13

9

8

4 5 3

12

1

2

10 11

7-6 4241262-Rev B

STEERING

7

IMPORTANT

Ensure turn stop gap of 0.030–0.090 in. (0.8–2.3 mm)

is maintained during turning radius (equal angle)

adjustment. Check and adjust turn stop gap as

necessary after performing any ball joint

adjustments. (See “Turn Stop Adjustment” on

page 7-4.)

8. Adjust (turn) ball joints (3 and 13) in or out equally as

needed. Tighten clamp bolts (4 and 10) and nuts (5

and 11).

9. Install steering cylinder (8) and castle nuts (2 and 7).

Tighten castle nuts to 80–110 lb-ft (108–149 N·m).

10. Check the turning radius in both directions.

11. Repeat steps 2 through 10 as needed until the

turning radius is equal in both directions.

12. Install new cotter pins (1 and 6).

Repair

Steering Wheel

Removal and Installation

See Figure 7-6.

1. Park the mower safely. (See “Park Mower Safely” on

page 1-6.)

Figure 7-6

2. Remove (unsnap) cap (1) from steering wheel (4).

3. Remove nut (2) and internal-tooth lock washer (3).

4. Remove steering wheel (4) and four washers (5)

from steering column (6).

Installation Notes

• Install steering wheel by reversing the order of

removal.

• Tighten the steering wheel nut (2) to 25–30 lb-ft (34–

41 N·m).

TN2969

3

2

6

1

4

5

STEERING

4241262-Rev B 7-7

7

Steering Tower Cover (Earlier

Machines)

NOTE

This procedure is for machines with the following serial

numbers:

Serial No. 67978 - 1651 ~ 1765

Serial No. 67979 - 1651 ~ 1797

Serial No. 67980 - 1651 ~ 1668

Serial No. 67981 - 1651 ~ 1742

Serial No. 67982 - 1651 ~ 1830

Serial No. 67983 - 1651 ~ 1683

Removal and Installation

See Figure 7-7.

1. Park the mower safely. (See “Park Mower Safely” on

page 1-6.)

Figure 7-7

2. Using the steering tilt control, tilt the steering column

(2) rearward.

3. Push throttle handle (4) forward.

4. Remove knob (3).

5. Remove six screws (5).

6. Carefully lift steering tower cover (1) and remove

from machine.

Installation Note

Install steering tower cover by reversing the order of

removal.

Steering Tower Cover (Later

Machines)

NOTE

This procedure is for machines with the following serial

numbers:

Serial No. 67978 - 1766 and Up

Serial No. 67979 - 1798 and Up

Serial No. 67980 - 1669 and Up

Serial No. 67981 - 1743 and Up

Serial No. 67982 - 1831 and Up

Serial No. 67983 - 1684 and Up

Removal

See Figure 7-8.

1. Park the mower safely. (See “Park Mower Safely” on

page 1-6.)

Figure 7-8

2. Using the steering tilt control, tilt the steering column

(2) rearward.

3. Push throttle handle (4) forward.

4. Remove knob (3).

5. Remove six screws (5).

6. Carefully lift steering tower cover (1) and remove

from machine.

TN2974

5

1

3

2

4

TN2974

5

1

3

2

4

7-8 4241262-Rev B

STEERING

7

Installation

See Figure 7-9.

Figure 7-9

1. Position steering tower cover (4) over steering tower

(1) and ensure head of carriage bolts (2) just touch

steering tower cover on both sides as shown in

Figure 7-9. Adjust carriage bolts (2) and nuts (3) as

necessary to achieve proper contact.

2. Secure steering tower cover with six mounting

screws (5).

Steering Column

Removal and Installation

See Figure 7-10.

1. Park the mower safely. (See “Park Mower Safely” on

page 1-6.)

2. Remove steering wheel. (See “Steering Wheel” on

page 7-6.)

3. Remove steering tower cover. (See “Steering Tower

Cover (Earlier Machines)” on page 7-7 or “Steering

Tower Cover (Later Machines)” on page 7-7.)

Figure 7-10

4. Using the tilt lever, tilt the steering column forward.

5. Support steering column (1).

6. Remove four screws (2), four lock washers (3), and

steering column (1).

Installation Notes

• Install steering column by reversing the order of

removal.

E

TN4664

2

4

1

3

5

3

2

TN4324

2

3

1

STEERING

4241262-Rev B 7-9

7

Steering Unit

Removal and Installation

See Figures 7-11 and 7-12.

1. Park the mower safely. (See “Park Mower Safely” on

page 1-6.)

2. Remove steering wheel. (See “Steering Wheel” on

page 7-6.)

3. Remove steering tower cover. (See “Steering Tower

Cover (Earlier Machines)” on page 7-7 or “Steering

Tower Cover (Later Machines)” on page 7-7.)

4. Remove steering column. (See “Steering Column” on

page 7-8.)

NOTE

If available, use a portable hydraulic filtering unit to

remove the hydraulic oil from the hydraulic tank. Place

the filtering unit suction hose in the tank, and pump the oil

into a clean and sealable container.

5. Using the tilt lever, tilt the steering column rearward.

Figure 7-11

NOTES

• Label all hydraulic hoses and record their locations to

ensure correct installation.

• Plug hydraulic hoses after disconnecting to prevent

loss of hydraulic oil.

6. Disconnect hydraulic hose (1) from steering unit port

“T.”

7. Disconnect hydraulic hose (2) from steering unit port

“P.”

8. Disconnect hydraulic hose (3) from steering unit port

“L.”

9. Disconnect hydraulic hose (4) from steering unit port

“R.”

10. Disconnect hydraulic hose (5) from steering unit port

“E.”

Figure 7-12

11. Using the tilt lever, tilt the steering column forward.

12. Support steering unit (8).

13. Remove four screws (6), four lock washers (7), four

spacers (9), and steering unit (8).

Installation Notes

• Install steering unit by reversing the order of removal.

• Check hydraulic oil level. Add oil as needed.

• Start the machine and check for hydraulic leaks and

cylinder operation. Repair as necessary.

1

3

2

TN3634

5

4

E

TN2971

1

5

4

2

3

TN4665

9

7

6

8

7-10 4241262-Rev B

STEERING

7

Steering Unit Service Fixture

See Figures 7-13 and 7-14.

Figure 7-13: Steering Unit Service Fixture

NOTICE

Figure 7-14

1. Place the steering unit service fixture (11) securely in

a vise.

2. Place the steering unit (10) into the service fixture

(11), input shaft down.

3. Secure the steering unit to the service fixture using

four M6-1 x 20 mm screws and M6 lock washers (12

and 13).

Required Tools or Equipment

Steering Unit Service Fixture

1 0.165 in. (4.2 mm) 6 2.0 in. (50.8 mm)

2 0.260 in. (6.6 mm) Ø Hole (4) 7 4.0 in. (101.5 mm)

3 2.283 in. (58.0 mm) Ø 8 1.5 in. (38.1 mm) Ø Hole

48.0 in. (202 mm) 945° (4)

5 2.0 in. (50.8 mm)

Do not clamp the steering unit directly into a vise.

Clamping the steering unit directly into a vise

may damage or distort the steering unit.

TN2142

1

5

3

2

6

7

8

4

9

TN2143

10

11

1312

STEERING

4241262-Rev B 7-11

7

Disassembly

See Figures 7-15 and 7-16.

Figure 7-15

1 Special Screw (3) 8 Gearwheel Rim 15 Spring Retaining Ring 22 Ball Stop

2 Special Screw (2) 9 Distributor Plate 16 Spool 23 Emergency Steering Ball

3 O-Ring (5) 10 Cardan Shaft 17 Thick Bearing Race 24 Housing

4 End Cover 11 O-Ring 18 Bearing 25 Name Plate

5 Spacer 12 Sleeve 19 Thin Bearing Race 26 Steering Relief Valve

6 O-Ring (2) 13 Cross Pin 20 Shaft Seal 27 Steering Relief Valve Spring

7 Gearwheel 14 Spring Set 21 Check Valve Ball

R

L

P

T

TN4339

3

4

5

6

8

6

9

10

11

12

13

14

15

16

17

18

23

20

21

22

24

25

26

27

7

19

2

1

7-12 4241262-Rev B

STEERING

7

!

CAUTION

NOTES

• Before attempting repairs or disassembly of any

hydraulic components, thoroughly clean the

components and work area. A clean work area is

essential to satisfactory operation of repaired

hydraulic components.

• Utilize steering unit service fixture for disassembly.

(See “Steering Unit Service Fixture” on page 7-10.)

1. Scribe a line from port “P” to bottom of steering unit.

This line can be used to determine port “P” with end

cover removed and for proper orientation of sections

for assembly.

2. Remove three special screws (1), two special screws

(2), and five O-rings (3).

3. Remove end cover (4) by sliding it off to the side.

4. Remove cardan shaft spacer (5).

5. Hold a hand under the gearwheel rim (8) and

gearwheel (7) to keep the gearwheel from falling out,

and remove the gearwheel rim (8), gearwheel (7),

and two O-rings (6).

6. Remove cardan shaft (10).

7. Remove distributor plate (9).

8. Remove O-ring (11) from housing (24).

9. Remove spool assembly.

10. Remove thin bearing race (19), bearing (18), and

thick bearing race (17).

11. Remove shaft seal (20).

12. Remove spring retaining ring (15).

13. Carefully press cross pin (13) out of the spool (16)

and sleeve (12), and remove spool from sleeve.

14. Press spring set (14) out of spool (16).

15. Remove fixture from vise and shake out check valve

ball (21), emergency steering ball (23), and ball stop

(22). Re-secure service fixture in vise with input shaft

down.

16. Remove housing (24) from service fixture.

17. Remove steering relief valve (26) and steering relief

valve spring (27).

Figure 7-16

Wear eye protection when assembling and

disassembling the steering unit. Springs and

other objects may be propelled into the air,

causing eye injury.

R

L

P

T

TN4340

Steps 1-3

Scribe line

aligned with

port “P.”

Steps 4-5

Steps 6-8 Steps 9-11

Steps 12-14 Step 15

Step 17

Spool

Assembly

Included in Seal Kit

3

4

5

7

8

6

10

9

11

24

17

18

19

20

24

13

16

12

15

14

21

22

23

24

26

27

24

2

1

STEERING

4241262-Rev B 7-13

7

Assembly

See Figures 7-17 through 7-19.

Figure 7-17

1 Special Screw (3) 8 Gearwheel Rim 15 Spring Retaining Ring 22 Ball Stop

2 Special Screw (2) 9 Distributor Plate 16 Spool 23 Emergency Steering Ball

3 O-Ring (5) 10 Cardan Shaft 17 Thick Bearing Race 24 Housing

4 End Cover 11 O-Ring 18 Bearing 25 Name Plate

5 Spacer 12 Sleeve 19 Thin Bearing Race 26 Steering Relief Valve

6 O-Ring (2) 13 Cross Pin 20 Shaft Seal 27 Steering Relief Valve Spring

7 Gearwheel 14 Spring Set 21 Check Valve Ball

R

L

P

T

TN4339

3

4

5

6

8

6

9

10

11

12

13

14

15

16

17

18

23

20

21

22

24

25

26

27

7

19

2

1

7-14 4241262-Rev B

STEERING

7

!

CAUTION

NOTES

• Inspect all parts for wear or damage and replace as

necessary.

• Lubricate all parts with clean hydraulic oil before

assembly.

• Always install new O-rings for assembly; used parts

may leak.

• Utilize steering unit service fixture for assembly. (See

“Steering Unit Service Fixture” on page 7-10.)

• Letter references (A-C) refer to components of Sauer

Danfoss Shaft Seal Tool.

1. Assemble relief valve (26 and 27) to housing (24).

Use new check valve o-ring included in seal kit.

2. Assemble shaft seal (20) onto guide (A).

3. Insert outer sleeve (B) into housing (24).

4. Place guide (A) on end of guide tool (C). Lubricate

shaft seal and O-ring.

5. Slide guide tool (C) into outer sleeve (B) and press

shaft seal into position. Remove outer sleeve and

guide tool. Guide (A) should remain inside housing

after seal is installed.

6. Install thin bearing race (19), bearing (18), and thick

bearing race (17) into housing (24).

7. Slide spool (16) into sleeve (12) and align so that

cross pin slots are adjacent to each other.

8. Center the spring set (14) in the spool and sleeve

assembly, and install spring retaining ring (15).

NOTES

• When installing spring set, insert the curved springs

between the flat springs and push in place.

• Spring retaining ring (15) must be able to rotate

unimpeded by the springs.

9. Press cross pin (13) in the spool and sleeve

assembly.

10. While holding the cross pin in place, guide the spool

and sleeve assembly into housing (23). When

installed, cross pin (12) must point towards port “P.”

Spool will push seal guide (A) out of housing as it is

installed.

Figure 7-18

Wear eye protection when assembling and

disassembling the steering unit. Springs and

other objects may be propelled into the air,

causing eye injury.

Required Tools and Materials

Seal Kit (Jacobsen PN 4197940)

Shaft Seal Tool (Sauer Danfoss SJ150L4011-01)

TN4341

Step 1

Included in Seal Kit

Step 2

Steps 3-5

Step 6 Steps 7-9

Step 10

26

27

24

20

A

B

C

24

17

18

19

24

12

13

16

14

15

24

Spool

Assembly

Cross

L

R

P

T

E

STEERING

4241262-Rev B 7-15

7

11. Place emergency steering ball (23) in port “P.”

12. Place ball stop (22) in port “P.”

13. Place check valve ball (21) in port “P.”

14. Install O-ring (11) in housing (24).

15. Place distributor plate (9) on housing (24) and align

scribe line and mounting holes.

16. Assemble cardan shaft (10) to spool (16) ensuring

cardan shaft engages with cross pin (13).

17. Place gearwheel (7) over the distributor plate (9).

NOTE

See step 16 in Figure 7-19. When installing the

gearwheel, the gearwheel must be correctly aligned so

that it engages with the cardan shaft. The cross pin (13)

in the spool assembly must line up with the bottom of the

spline in the gearwheel (7).

18. Install O-rings (6) into groove on each side of the

gearwheel rim.

19. Place gearwheel rim (8) over the distributor plate (9)

and gearwheel (7). Align scribe line and mounting

holes.

20. Install spacer (5) over the cardan shaft (10).

NOTE

Place end cover so that the hole marked “P” lines up with

port “P” in the housing.

21. Using scribe line, align end cover (4) to housing (24).

Install special screws (1) with O-rings (3) into ports

“T,” “P,” and “E.” Install special screw (2) with O-ring

(3) into ports “L” and “R.” Tighten screws in an

alternating pattern to 20–24 lb-ft (27–33 N·m).

22. Remove the steering unit from the service fixture.

23. Assemble steering unit into mower.

NOTE

Do not tighten steering column mounting hardware until

steering relief pressure has been set. Column must be

removed when adjusting relief valve.

24. Set steering unit relief pressure. (See “Lift/Steering

Relief Valve Adjustment” on page 6-48.)

!

WARNING

Figure 7-19

Keep hands and arms clear of steering wheel on

initial startup of engine. Steering unit can

become a hydraulic motor if step 17 is not

correctly performed.

R

L

P

T

TN4342

21

22

23

24

Steps 11-13 Steps 14-16

Step 16

Steps 17-20

Step 21

10

9

11

24

5

6

7

9

Cross

Spline

Bottoms

8

3

4

Scribe line

aligned with

port “P.”

Included in Seal Kit

L

P

R

E

T

Port

“P”

2

1

7-16 4241262-Rev B

STEERING

7

Throttle Lever Assembly (Earlier

Machines)

NOTE

This procedure is for machines with the following serial

numbers:

Serial No. 67978 - 1651 ~ 1765

Serial No. 67979 - 1651 ~ 1797

Serial No. 67980 - 1651 ~ 1668

Serial No. 67981 - 1651 ~ 1742

Serial No. 67982 - 1651 ~ 1830

Serial No. 67983 - 1651 ~ 1683

Removal and Installation

See Figures 7-20 and 7-21.

1. Park the mower safely. (See “Park Mower Safely” on

page 1-6.)

2. Remove steering column. (See “Steering Column” on

page 7-8.)

Figure 7-20

3. Using the tilt lever, tilt the steering column forward.

4. Support steering unit (2) and steering unit bracket

(1).

5. Remove two screws (3) and two lock washers (4).

Move steering unit (2) and steering unit bracket (1)

aside to provide clearance for throttle lever assembly

removal.

TN2976

2

1

3

4

STEERING

4241262-Rev B 7-17

7

Figure 7-21

6. Remove nut (28), flat washer (20), and screw (21).

7. Loosen set screw (27) and disengage throttle cable

(29) from pin (25).

8. Remove nut (5), flat washer (6), and spacer (7).

9. Loosen nut (26) and remove throttle arm (9), conical

spring washers (10), flange bushings (11), and

throttle handle (18) from steering tower (16).

10. Remove two nuts (24), two lock washers (23), two

flat washers (22), two screws (19), and throttle

support bracket (12).

11. Remove two lock nuts (13), two carriage bolts (15),

and throttle stop (14).

Installation Notes

• Install throttle lever assembly by reversing the order

of removal.

• Install throttle cable (29) on throttle support bracket

(12) so that throttle cable aligns with hole in pin (25).

• Tighten nut (5) until sufficient force is required to

move throttle lever and engine speed is maintained

during operation. After tightening nut (5), tighten

screw (8) to 100 lb-in. (11.3 N·m) to eliminate play in

throttle lever assembly.

• Position throttle stop (14) so that it contacts throttle

handle (18) when engine is at high idle. Tighten

carriage bolts (15) to 157 lb-in. (17.7 N·m).

5 Nut 10 Conical Spring Washers (6) 15 Carriage Bolt (2) 20 Flat Washer 25 Pin

6 Flat Washer 11 Flange Bushing 16 Steering Tower 21 Screw 26 Nut

7 Spacer 12 Throttle Support Bracket 17 Knob 22 Flat Washer (2) 27 Set Screw

8 Screw 13 Lock Nut (2) 18 Throttle Handle 23 Lock Washer (2) 28 Nut

9 Throttle Arm 14 Throttle Stop 19 Screw (2) 24 Nut (2) 29 Throttle Cable

TN297

8

TN2978

5

6

7

8

9

11

13

14

15

16

17

18

10

11

19

23

21

20

22

24

25

26

10

28

29

12

27

7-18 4241262-Rev B

STEERING

7

Throttle Lever Assembly (Later

Machines)

NOTE

This procedure is for machines with the following serial

numbers:

Serial No. 67978 - 1766 and Up

Serial No. 67979 - 1798 and Up

Serial No. 67980 - 1669 and Up

Serial No. 67981 - 1743 and Up

Serial No. 67982 - 1831 and Up

Serial No. 67983 - 1684 and Up

Removal and Installation

See Figures 7-22 and 7-23.

1. Park the mower safely. (See “Park Mower Safely” on

page 1-6.)

2. Remove steering column. (See “Steering Column” on

page 7-8.)

Figure 7-22

3. Using the tilt lever, tilt the steering unit bracket (1)

forward.

4. Support steering unit (6) and steering unit bracket

(1).

5. Remove two nuts (4), spacers (5), flange bearings

(2), and shoulder bolts (3). Move steering unit (6) and

steering unit bracket (1) aside to provide clearance

for steering tower removal.

TN4329

6

1

4

5

2

3

STEERING

4241262-Rev B 7-19

7

Figure 7-23

6. Remove nut (30), flat washer (22), and screw (23).

7. Loosen set screw (29) and disengage throttle cable

(31) from pin (27).

8. Remove nut (7), flat washer (8), and spacer (9).

9. Loosen nut (28) and remove throttle arm (11), conical

spring washers (12), flange bushings (13), and

throttle handle (20) from steering tower (18).

10. Remove two nuts (26), two lock washers (25), two

flat washers (24), two screws (21), and throttle

support bracket (14).

11. Remove two lock nuts (15), two carriage bolts (17),

and throttle stop (16).

Installation Notes

• Install throttle lever assembly by reversing the order

of removal.

• Install throttle cable (31) on throttle support bracket

(14) so that throttle cable aligns with hole in pin (27).

• Tighten nut (7) until sufficient force is required to

move throttle lever and engine speed is maintained

during operation. After tightening nut (7), tighten

screw (10) to 100 lb-in. (11.3 N·m) to eliminate play

in throttle lever assembly.

• Position throttle stop (16) so that it contacts throttle

handle (20) when engine is at high idle. Tighten

carriage bolts (17) to 157 lb-in. (17.7 N·m).

7 Nut 12 Conical Spring Washers (6) 17 Carriage Bolt (2) 22 Flat Washer 27 Pin

8 Flat Washer 13 Flange Bushing 18 Steering Tower 23 Screw 28 Nut

9 Spacer 14 Throttle Support Bracket 19 Knob 24 Flat Washer (2) 29 Set Screw

10 Screw 15 Lock Nut (2) 20 Throttle Handle 25 Lock Washer (2) 30 Nut

11 Throttle Arm 16 Throttle Stop 21 Screw (2) 26 Nut (2) 31 Throttle Cable

TN297

8

TN2978

7

8

9

10

11

13

15

16

17

18

19

20

12

13

21

25

23

22

24

26

27

28

12

30

31

14

29

7-20 4241262-Rev B

STEERING

7

Steering Tower

Removal and Installation

See Figure 7-24.

1. Park the mower safely. (See “Park Mower Safely” on

page 1-6.)

2. Remove steering column. (See “Steering Column” on

page 7-8.)

3. Remove throttle lever assembly. (See “Throttle Lever

Assembly (Earlier Machines)” on page 7-16 or

“Throttle Lever Assembly (Later Machines)” on

page 7-18.)

Figure 7-24

NOTE

Left side of steering tower weldment removed for picture

clarity.

4. Disengage tilt cable (4).

5. Remove two screws (5) and tilt cable (4).

6. Remove screw (10) and nut (7).

7. Remove nut (1), three washers (2) (if equipped), bolt

(3), and gas spring (11).

8. Remove four carriage bolts (8) and flange nuts (9),

and remove steering tower (6).

Installation Note

• Install steering tower by reversing the order of

removal.

• Do not overtighten nut (1). Gas spring must pivot

freely.

TN4000

1

4

11

8

10

9

6

2

3

5

7

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Ransomes 67978, 67979, 67980, 67981, 67982, 67983 User manual

Ransomes 67978, 67979, 67980, 67981, 67982, 67983 User manual

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