50 Series Mechanical Handouts.

5O SERIES MECHANICAL BALLS AND CAPS JOINTS

•Theory of Operation

•Component Description•Component Description

•Circuit Description

•Setting & Adjustments

•Trouble Shooting

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Ball and socket joints

LeTourneau Training Theory of Operation

BALL AND SOCKET COMPONENTS

1 The Ball1. The Ball2. The Lip Seal3. The Liner4. The Socket Cap4. The Socket Cap5. The Bolt6. The Spacer Plate7. The Shims8. The Socket

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The Ball

Add machine link

L950

D950D950

L1150

L1350

L1850

L2350

LeTourneau Training Component Description

Ball Location


The Ball

BALL IS MACHINEDTHRU HOLE DRILLED FOR LUBRICATIONTHRU HOLE DRILLED FOR LUBRICATION

CASE HARDENED BALL FOR WEAR HARDENED SURFACE ENDS AT NECK TO ALLOW WELD ABILITY OF BALL BASE

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THE SOCKETThe Socket is the stationary portion of the joint that is welded solid to the machine or structure.

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The Socket Cap• The socket cap is the portion of the joint that bolts to the socket and captures the ball into the joint.

BALL CAP WEIGHT (*Approximate)

HOIST REAR AXLE LOADER LIFT ARM HOIST CYLINDER MIDDLE PIVOT REAR AXLE

PIVOTD-950 N/A N/A 210 lbs. 202 lbs.L-950 275 lbs 140 lbs 210 lbs. 202 lbs.L-1150 275 lbs 140 lbs 210 lbs. 202 lbs.L-1350 275 lbs. 202 lbs. 309 lbs. 202 lbs.

L-1850 610 lbs. 250 lbs. 309 lbs. 202 lbs.

L-2350 610 lbs. 389 lbs. 309 lbs. 202 lbs.

These weights are only approximate and provided as a guide for determining proper liftingg y pp p g g p p gprocedures and equipment. In all cases, adequate equipment should be used to provide a goodsafety margin.


THE LINER• Consists of two semi-spherical halves pthat fit in the socket and cap.

• Made of nickel-aluminum-bronze.

• Provides a low friction, high output load carrying capacity.

•Grooved to allow grease to flow between liner surface and ball.


THE SPACERThe spacer serves two purposes:

• One -- is to complete the sphere of the cap and socket.

The spacer is constructed of A-36 allow.

• Two -- locks the liner halves into the socket and cap and prevents them from rotating in the joint.


THE SHIMS •The purpose of the shims are to provide adjustment of the clearance in the joint that allows for movement and lubrication.

7.5" 9” 12” 14”1 ea. 3/16" spacer plate

4 ea 030" shim

1 ea. 3/16” spacer plate

1 ea. 3/16” spacer plate

1 ea. 1/4” spacer plate4 ea. .030 shim

1 ea. .018" shim

4 ea. .007" shim

p p

4 ea. .030” shim

2 ea. .018” shim

2 ea. .007” shim

p p

4 ea. .030” shim

2 ea. .018” shim

2 ea. .007” shim

p p

2 ea. .030“ shim

2 ea. .018” shim


THE LIP SEALThe purpose of the lip seal is to: prevent contamination from entering the socket joint. It also prevents water from entering the joint during washing of the machine.

1 Socket or Cap1. Socket or Cap2. Seal3. Seal Groove


BOLTS

The bolts hold the joint together mechanically.

See SIL 294


THE COMPLETE BALL JOINT

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BALL SOCKET JOINT CLEARANCES

See SIL 439

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PLACEMENT OF INDICATOR


READING JOINT CLEARANCE

The joint clearance is referred to as the “Snap Value”

(A) Green area – needle moves slowly in proportion tohow much machine is moved, steered, hoisted. etc. Thisis DEFLETION

(B) Yellow area – Needle snaps quickly between lowand high when the machine is moved, steered,hoisted, etc. This is the CLEARANCE.


ADJUSTING THE CLEARANCE

To adjust the clearance in the joint, you add or take away shim plates.


EXCESSIVE HEAT IN JOINT

CAUSES:Clearance to tightClearance to tight.

Check adjust of clearance.

Lack of lubrication .Lack of lubrication . Check lubrication supply. Check lubrication lines.

Liners out of specification

Warped socket or cap.

LeTourneau TrainingClick to edit LeTourneau TrainingTroubleshooting

JOINT IS TOO TIGHTCheck clearance of Joint.

Add shim to adjust.


LUBRICATION

M k h h f hMake sure that there is fresh grease present at the joint. Check injector settings.

Check for broken or loose grease lines

Make sure there is grease in the grease reservoir


grease lines.grease reservoir

LUBRICATION

M k h h f h Ch kMake sure that there is fresh grease present at the joint.

Check injector settings.



LeTourneau Training Troubleshooting


LUBRICATIONThe joints are lubricated by two methods:1. From the outside of the ball socket and cap.2 F th t f th b ll2. From the center of the ball.


LUBRICATIONLubrication from the outside of the joint is done at the:

Lift H i t C li dLiftarm Hoist Cylinder

Rear Axle


LUBRICATIONLubrication from the center of the ball done at the:

Lift B ll d th Middl Pi tLiftarm Ball and the Middle Pivot

The Liftarm ball uses a drilled and taped plug with a lube line attached.The Liftarm ball uses a drilled and taped plug with a lube line attached.

The middle pivot uses a thru hole tapped at the bottom and nipple extension.


LUBRICATIONCenter plug not installed in hoist cylinder balls could cause.


INSPECTIONWorn Socket

and Cap. Worn Ball Cracked or broken Ball or Slab.


WORN SOCKET OR BALL

BALL SOCKET SPECIFICATIONSNominal diameter 7.5" 9” 12” 14”

8.003" 9.503” 12 503” 14 503” Machined diameter

8.003 ± .002”

9.503 ± .002”

12.503 ± .002”

14.503 ± .002”

*Maximum socket wear before liner may be affected.

0.030" 0.030” 0.030” 0.030”

BALL BASE SPECIFICATIONS

If any of these measurements are out of specification replace the socket and cap.

S S C C SNominal diameter 7.5" 9” 12” 14”

Machined diameter7.500" ± .003”

8.997” ± .003”

12.000” ± .003”

14.000” ± .003”

*Max ball wear before liner may 0.060" 0.065” 0.070” 0.080”

be affected0.060 0.065 0.070 0.080

Replace Balls using Let 1 welding procedures.


REPAIR OF SOCKET OR BALL

Follow Let 1 procedure for removal and installation repairs of balls and socketssockets.

Do not do this Pre heat before gouging and weldingDo not do this. Pre-heat before gouging and welding. Maintain heat during welding.

LeTourneau Training Removal and Installation

CRACKED AND BROKEN BALLSWhen welding use Let 1 Field Welding Procedure found on Knowledge Base Article 436.

Make sure preheat is used andpost heat is used.

LeTourneau Training Removal and installation

50 SERIES MECHANICALPINS AND BUSHINGSPINS AND BUSHINGS

• Theory of Operation

• Component Description

• Circuit Description

• Setting and Adjustment

• T bl Sh ti• Trouble Shooting

LeTourneau Training 2012

SAW-CUT PINS AND BUSHINGS


SAW-CUT PINS AND BUSHINGS

The bolt torque maintains the clamping force that locks the sawcut bushing to the pin and bore.

Why is a re-torque needed? To maintain bushing conformation to To maintain bushing conformation to:

Bore Tapers

Cylinder forces Cylinder forces Cylinder Bushing Pin Saw-cut Bore (liftarm, bellcrank, level

link, bucket)


SAW-CUT PINS AND BUSHINGSSPHERICAL BEARING BUSHING

Split outer race Spherical inner race

SPHERICAL BEARING BUSHING

Spherical inner race Outer seal Retaining rings


SAW-CUT PINS AND BUSHINGSTaper PinTaper Pin

Center area is carburized to58-64 HRC.

Remainder of surfaces are toRemainder of surfaces are tobe at a minimum 36 HRC.


SAW-CUT PINS AND BUSHINGSSaw-Cut BushingSaw Cut Bushing

Inside taper matches the taper on the end of the pin.

Locks the pin to the bore.

Accommodates removal of Accommodates removal of the pin.

The split should be 118” The split should be .118 wide.


SAW-CUT PINS AND BUSHINGSRetaining WasherRetaining Washer

Captures the sawcut

To measure depth of bucket pin

bushings

Applies the clamping forceforce

Heat treated


SAW-CUT PINS AND BUSHINGSBoltBolt

1 ¼ - 7tpi torque to 1363 ft lbs

1 ½ - 6tpi torque to 2371 ft lbs

1 ¾ 5 i 68 f lb (S ) U d L 1850 & L 2350 1 ¾ - 5tpi torque to 68 ft lbs (Super nut) Used on L-1850 & L-2350 hoist rod pin

Follow Re-torque Intervals and Check at every PM!


SAW-CUT PINS AND BUSHINGSBolt Steering CylinderBolt Steering Cylinder

1 – 8tpi torque to 425 ft lbs L-950 – L-1150

1 ¼ - 7tpi torque to 850 ft lbs L-1350 – L-2350

Follow Re torque Intervals and Check at Follow Re-torque Intervals and Check at every PM!


SAW-CUT PINS AND BUSHINGSSafetySafety

When installing any pin or bushing, make sure that all local safetyregulations and rules are followed.

Wear any and all PPE required to accomplish the task.

Use the appropriate lifting practices to maneuver heavy parts intoposition during installation.


SAW-CUT PINS AND BUSHINGSInstalling BushingInstalling Bushing

When installing bushing into the bore and onto the pin, make sure that the split is positioned 90°to the centerline of the component.

Opposite saw-cut is positioned 180⁰ in relation.

Recheck bolt torque at every PM.


SAW-CUT PINS AND BUSHINGSSeating the bushing and pinSeating the bushing and pin

When seating the bushing, do notstrike the bolt or retaining washerwith a metal sledge hammer. Use anappropriate sized mallet on the boreear to advance the bushing onto theear to advance the bushing onto thepin and into the bore.

Repeat until the bolt doesn’t advancehwhen torque is set.

Recheck torque at every PM.


SAW-CUT PINS AND BUSHINGSRemoval toolRemoval tool

Remove clamping bolt and capture platewashers.

Install bushing removal tool using four bolts andthe tapped holes in the sawcut.

Tighten the four bolts evenly. Tighten the four bolts evenly. Bushing should press off the pin and out of the

bore. If bushing does not come out, strike the center of

h l h hthe tool with a hammer.


STRAIGHT PINS AND BUSHINGSLevel Link to Bucket Pin (L-950 & L-1150)Level Link to Bucket Pin (L 950 & L 1150)

The level link to bucket pivot joint is made up of:

The Pin Pin Cap Lug Bolts Lock washers


STRAIGHT PINS AND BUSHINGSLevel Link to Bucket Pin (L-950 & L-1150)

The pin is 4 ½ inch diameter.

Level Link to Bucket Pin (L 950 & L 1150)

The pin is 4 ½ inch diameter.

One assembly made up ofOne assembly made up of: Pin Lug Pin Section


STRAIGHT PINS AND BUSHINGSLevel Link to Bucket Pin (L-950 & L-1150)Level Link to Bucket Pin (L 950 & L 1150)

The pin lug secures the pin in place

Prevents rotation of the pin independent of the bucket movement

The bolts and locking tab secures the pin assembly in place


STRAIGHT PINS AND BUSHINGSBucket to Liftarm PinBucket to Liftarm Pin

The joint is made The joint is made up of: Pin Pin Retainer Caps

Sleeves Pin Puller Caps Shimsp

Bushings Bushing washer Seal

Spacer Bolts


STRAIGHT PINS AND BUSHINGSBucket to Liftarm PinBucket to Liftarm Pin

Machined to sizeCased harden to a min of 55 Rc


STRAIGHT PINS AND BUSHINGSLiftarm BushingLiftarm Bushing

Provides a bearing surface for the joint.

Made of an “nickel-aluminum bronze alloyaluminum-bronze alloy.


STRAIGHT PINS AND BUSHINGSSpacerSpacer

Separates the two bushings and allows for bushings and allows for flow of grease into the joint.


STRAIGHT PINS AND BUSHINGSSealSeal

Keep grease in thejoint.


STRAIGHT PINS AND BUSHINGSPin sleeve and puller cap assemblyPin sleeve and puller cap assembly

Cap is installed in bossand held in place by snapring.ring.


STRAIGHT PINS AND BUSHINGSThrust bushing washerThrust bushing washer

Takes the thrust loads appliedto the joint during operation.


STRAIGHT PINS AND BUSHINGSShimShim


STRAIGHT PINS AND BUSHINGSRetainer CapRetainer Cap


STRAIGHT PINS AND BUSHINGSBell Crank PinBell Crank Pin

Pin Sleeve Bushings Bushings Capture plates Shims


STRAIGHT PINS AND BUSHINGSPinPin


STRAIGHT PINS AND BUSHINGSSleeveSleeve


STRAIGHT PINS AND BUSHINGSBushingsBushings


STRAIGHT PINS AND BUSHINGSShims Retainer PlatesShims Retainer Plates


STRAIGHT PINS AND BUSHINGSROPS PINROPS PIN


STRAIGHT PINS AND BUSHINGSCapture sleeveCapture sleeve


STRAIGHT PINS AND BUSHINGSBolt and Super NutBolt and Super Nut


STRAIGHT PINS AND BUSHINGSSuper Nut and WasherSuper Nut and Washer


BUSHINGS AND PINS

POSSIBLE PROBLEMS

Loose movement

Causes

Loss of clamping force of capture washers.Loss of bolt torque

Noisy movement

Cause

Lack of grease


LUBRICATION

M k h h f h Ch kMake sure that there is fresh grease present at the joint.

Check injector settings.





50 Series Mechanical Handouts.

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