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Service TrainingMALAGA

Challenger 35 & 45

SaraMAY 1997

X. UNDERCARRIAGE

1. Components2. Belts and Spacers3. Testing & Adjusting

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X - 1

P age:

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X - 2

P age:

PIN

CAP

TAB

LOCKNUT

SETSCREW

FRONT IDLER ASSEMBLY

LEVER

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X - 3

P age:

UNDERCARRIAGE

CAP

SEAL GROUP

BEARINGASSEMBLIES

MID-ROLLERS

MID-ROLLERASSEMBLY

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X - 4

P age:

DRIVER

DUO-CONESEAL

HUB

SPHERICALBEARING

HUB

REACTION ARM

REAR DRIVER ASSEMBLY

REAR AXLEHOUSING

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X - 5

P age:

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CHAPTER : Undercarriage

CHALLENGER 35 & 45

X-6Page:

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CHALLENGER 35 & 45

X-7Page:

Available Belt Widths

GAUGE AND BELT COMBINATIONS

Spacer Length

(each)

Desired Gauge

Spacing

NoSpacers

25.4 mm(1 in.)

50.8 mm(2 in.)

76.2 mm

(3 in.)

101.6 mm(4 in.)

150.6 mm(6 in.)

203.2 mm(8 in.)

254 mm(10 in.)

355.6 mm(14 in.)

406, 457 mm (16, 18 in.)

406, 457, 508 mm (16, 18, 20 in.)

406, 457, 508 mm (16, 18, 20 in.)

406, 457, 508 mm (16, 18, 20 in.)

406, 457, 508. 635 mm (16, 18, 20, 25 in.)

406, 457, 508. 635 mm (16, 18, 20, 25 in.)

406, 457, 508. 635, 813 mm (16, 18, 20, 25, 32 in.)

406, 457, 508. 635, 813 mm (16, 18, 20, 25, 32 in.)

406, 457, 508. 635, 813 mm (16, 18, 20, 25, 32 in.)

1524 mm(60 in.)

1575 mm(62 in.)

1626 mm(64 in.)

1676 mm

(66 in.)

1727 mm(68 in.)

1828 mm(72 in.)

1930 mm(76 in.)

2032 mm(80 in.)

2235 mm(88 in.)

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CHALLENGER 35 & 45

X-8Page:

ADJUSTMENTS

UndercarriageAdjustments and

Procedures

Procedure to Detension

and Tension the Track

Detensioning

Adjustments and procedures to the undercarriage include:

• Procedure to detension and tension the track

• Procedure to check nitrogen charge (when adjusting track

tension) - SM 29/July/96

• Procedure to raise and lower the tractor

• Adjustment procedures to align the belts - SM 18/March/96

• Procedure to remove the undercarriage (change tractor

gauge) - SI, SEHS9982 (8/96) - Appendix

1. Connect one end of the charging hose assembly to the left "+"

implement coupler port of the No. 3 or No. 4 implement con-

trol valve and the other end to the quick disconnect fitting on

the manifold assembly. If the charging hose assembly cannot

be connected to the quick disconnect, see the topic titled

"Release of Residual Pressure."

To check the current charge pressure, first close the valve on

the charging hose. Open the charging valve (requires a 13

mm wrench) on the manifold assembly and read the gauge.

The charging valve is the valve under the guard. The charge

pressure should be 19000 kPa (2750 psi).

2. Place the No. 3 or No. 4 implement control lever (depending

how the tractor is equipped) for the port selected in the

FLOAT position.

3. Open the charging valve (if not already open) and the charging

hose valve to release the tension charge pressure into the

implement hydraulic system.

4. As the tension charge pressure is released, the front idlers will

pivot rearward and the belt will sag. Push the idlers rearward

to finish retracting the ram.

5. Close the charging valve and remove the charging hose assem-

bly.

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CHALLENGER 35 & 45

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ADJUSTMENTS

Maintenance Recharge

Tensioning (Unopened

System)

Release of Residual

Pressure

1. Verify that the charging valve is closed.

2. Connect one end of the charging hose assembly to the left "+"

implement coupler port of the No. 3 or No. 4 implement con-

trol valve and the other end to the quick disconnect fitting on

the manifold assembly. If the charging hose assembly cannot

be connected to the quick disconnect, see the topic titled

"Release of Residual Pressure."

3. Start the engine and run at low idle. Place and hold the No. 3

or No. 4 implement control lever (depending how the tractor is

equipped) in the RAISE position.

4. With the charging valve open 1/4 to 1 full turn maximum, wait

a minimum of 50 seconds for the hydraulic ram to fully

charge.

5. Close the charging hose valve first. Continue holding the

implement control lever in the RAISE position.

Read the gauge to verify the tension charge pressure. The

charge pressure should be 19000 kPa (2750 psi).

6. If the charge pressure is correct, close the charging valve and

open the charging hose valve.

7. Shut off the engine and place the implement control lever in

the FLOAT position. Remove the charging hose assembly.

If difficulty is encountered when connecting the charging hose to the

quick disconnect fitting, the resistance may be due to hydraulic pres-

sure behind the quick disconnect nipple. The pressure can be safely

relieved by using the following procedure:

1. Verify that the charging valve (3) is closed.

2. Using an 11/16 in. wrench, loosen the quick disconnect fitting

(1) 1/2 to 3/4 of a turn. DO NOT loosen beyond 3/4 of a turn.

A few drops of oil may leak out at the base along as the pres-

sure is relieved. If a significant amount of oil leaks or sprays

out, tighten the coupler immediately. The hand valve may be

malfunctioning and the hydraulic ram can only be safelydetensioned through the use of the bleeder screw.

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CHALLENGER 35 & 45

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ADJUSTMENTS

Check nitrogen Chargein Accumulator when

Adjusting Track

Tension

NOTE :

Check the dry nitrogen gas charge in the accumulator each time thetract tensioner group is adjusted. Use the same tooling used to adjust

the track (not the nitrogen charging group). Use the following proce-

dure for adjustment.

1. Charge the tensioner group to a minimum of 17 200 kPa (2500

psi) using 1U9058 Hose Group, then close the gate valve. Stop the

engine and place the control lever in the FLOAT position.

2. Open the gate valve enough to slowly relieve the tensioner

pressure. The gauge pressure should steadily decrease from 17 200

kpa (2500 psi) until a rapid drop in pressure occurs. Record the pres-

sure at which the rapid drop occurred and the resulting pressure

immediately after the rapid pressure drop. Close the gate valve.

The pressure at which the rapid drop occurs is the approximate

dry nitrogen precharge of the accumulator. The rapid pressure drop

should occur between 10 000 and 12 000 kPa (1450 and 1750 psi)

and drop rapidly at the maximum of 1400 kPa (200 psi). If the range

of the rapid pressure drop exceeds 1400 kPa (200 psi), the pressure

was bled too quickly. An inaccurate pressure reading result. Recharge

and re-bleed the tensioner group to obtain a better reading. The slow-

er the bleed rate, the more accurate the pressure measurement will be.

4. If the rapid pressure drop occurs below 10 000 Kpa (1450 psi)

or does not occur at all, the accumulator requires service or replace-

ment.

Do not operate the machine with an accumulator that has an inade-

quate nitrogen charge. The accumulator functions as a spring for the

undercarriage to recoil.

Machine operation with and inadequate nitrogen charge could result

in undercarriage damage and/or steering difficulty.

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CHALLENGER 35 & 45

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ADJUSTMENTS

Procedure to Raise andLower the Tractor

NOTE:

1. Raise the front of the tractor by placing a jack under the centerof the hardbar. Lift the tractor until approximately 102 mm (4

in.) of clearance exists between the belt treadbars and the

ground. Place stands under the flat support surfaces provided

on each of the frame rails. Lower the jack until the flats rest

on the stands. Remove the jack.

2. Raise the rear of the tractor by placing a jack under the center

of the swinging hardbar, directly behind the front pivot brack-

et. Lift the tractor until approximately 102 mm (4 in.) of

clearance exists between the belt treadbars and the floor.Place stands under each side of the drawbar cage. Lower the

jack until the cage rests on the stands. Remove the jack.

3. Check the stability of the support system by trying to manual-

ly shake the tractor. Do not continue with any procedure until

satisfied that the tractor is secure.

Reverse the procedure to lower the tractor.

If the belts must be removed, approximately 204 mm (8 in.) of clear-

ance will be needed.

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CHALLENGER 35 & 45

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ADJUSTMENTS

New Track AlignmentProcedure

Procedure #1

• Alignment Check

• Adjust Track Alignment

NOTE :

This Procedure replaces the current procedure found in the Operation

& Maintenance Manual.

1. Travel on a smooth and level surface for 61-91 m (200-300 ft)

at a speed less than 8 km?h (5 mph) without turning the steeringwheel. Allow the tractor to coast to a stop.

2. Apply the parking brake. Stop the engine. Block the front and

rear of the track.

3. Measure the clearance between the inside edges of the front

midwheel and the sides of the guide-blocks. If these distances agree

withing 2 mm (.080 in), the track is aligned correctly. Otherwise, use

the following procedure to adjust the alignment.

1. To cause the guide-blocks to ride closer to the outside mid-

wheels, first loosen outside locknut and turn screw counterclockwise

1/4 turn. Loosen the opposite side locknut and tighten the correspond-

ing set screw to a torque of 55±10 Nm (40±7 lb ft).

2. To cause the guide-blocks to ride closer to the inside midwheel,

loosen the inside locknut and turn the setscrew counterclockwise 1/4turn. Loosen the opposite side locknut and tighten the corresponding

set screw to a torque of 55±10 Nm (40±7 lb ft).

Do not adjust the setscrews more than 1/4 turn at a time.

3. Repeat the Checking Track Alignment procedures. If needed,

repeat Steps 1 and 2 above until guide-blocks are properly centered.

4. Tighten both locknuts to a torque of 136±15 Nm (100±11 lb

ft).Hold the setscrews when tightening the locknuts to prevent over-tightening the set screws.

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CHALLENGER 35 & 45

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ADJUSTMENTS

Procedure #2

• Alignment Check

• Adjust Track Alignment

NOTE :

1. After belt/track tension has been applied drive the machine on a

level paved road with as little steering as possible for approximately

15 to 18 minutes.

2. Stop the machine. Immediately record the maximum tempera-

ture of the inboard and outboard idler (inner) side walls. If the tem-

perature difference between the inboard and outboard idler is 22 deg.

C (40 deg. F) or more, proceed to step 3. If the temperature differ-

ence between the inboard and outboard idler is less than 22 deg. C(40 deg. F) belt/track is in alignment.

1. If the outer idler is the hottest, then loosen locknuts and back

inside setscrew out (counterclockwise) 1/4 turn. Turn outside screw in

(clockwise) 1/4 turn. If the inner idler is the hottest then loosen lock-

nuts and back outside setscrew out (counterclockwise) 1/4 turn. Turn

inside setscrew in (clockwise) 1/4 turn.

2. Tighten both setscrews to a torque of 55±10 Nm (40±7 lb ft).

Tighten locknuts to a torque of 136±15 Nm (100±11 lb ft).

Do not adjust the setscrews more than 1/4 turn at a time.

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CHALLENGER 35 & 45

X-14Page:

ADJUSTMENTS

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CHALLENGER 35 & 45

ADJUSTMENTS

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