Procedure to Rework 13.6 m (44.62 ft) Coalspur Mast Encoder on Certain MD6250 Rotary Drills {1408} Caterpillar


Procedure to Rework 13.6 m (44.62 ft) Coalspur Mast Encoder on Certain MD6250 Rotary Drills {1408}

Usage:

MD6250 DN8
Rotary Drill
MD6250 (S/N: DN8104-105)

Introduction

This special instruction provides the information to rework the mast encoder on certain machines listed above.

Do not perform any procedure in this Special Instruction until you have read the information and you understand the information.

Safety Section

------ WARNING! ------

Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.


------ WARNING! ------

Failure to follow all safety guidelines prescribed in this document and by governing authorities and regulatory agencies may result in severe injury or death of personnel or machine damage.


------ WARNING! ------

When removing a major component or attachment, ensure that it is properly blocked or secured before removing mounting hardware. An assembly that is disconnected without proper blocking may shift or fall, resulting in serious injury or death of personnel or machine damage.


------ WARNING! ------

Personal injury or death can result from improper maintenance procedures. To avoid injury or death, follow the procedures exactly as stated below.


------ WARNING! ------

Personal injury can result from improper handling of chemicals.

Make sure you use all the necessary protective equipment required to do the job.

Make sure that you read and understand all directions and hazards described on the labels and material safety data sheet of any chemical that is used.

Observe all safety precautions recommended by the chemical manufacturer for handling, storage, and disposal of chemicals.


------ WARNING! ------

Climbing equipment may be required to access this service point. Refer to the Operation and Maintenance Manual, "Mounting and Dismounting" topic for safety information.


------ WARNING! ------

Before servicing/performing maintenance on the machine, electrical power must be physically disconnected; battery plugs must be disconnected from the batteries, or the trailing cable must be unplugged, and warning tags and padlocks shall be applied by a certified electrician. Certified electricians shall perform or direct any electrical work, including any energized testing, repair work in controllers, motors, or other approved compartments, and shall insure that all compartments are properly closed and inspected prior to re-energization. All applicable lock out and tag out procedures must be followed.


------ WARNING! ------

Do not operate the machine if any guards or covers are missing or inadequately secured. Personnel could be seriously injured or machine damage may occur.


------ WARNING! ------

Observe the safe working load limits of all lifting and blocking devices and keep a safe distance from suspended/blocked loads. Personnel may be seriously injured or killed by falling loads.


Rework Procedure

Structures Rework ( 578-0957 Mounting Bracket Gp)

Required Part

Table 1
Required Part 
Item  Qty  Part Number  Part Name 
578-5758  Shim 
118-5805  Special Race Bearing 
487-5859  Position Sensor Gp 
240-6577  Threaded Rod 
487-5860  Position Sensor 
469-2140  Spacer 
578-0959  Sheave 

Rework procedure



    Illustration 1g06422115
    Before rework

  1. To rework the crown, follow the set of instruction:

    • Remove and discard cab side sheave and retain hoist cable.

    • Remove and retain crown harness, depth encoder, and beacons.

    • Remove and retain crown chain link.

    • Cut cab side sheave bracket.

    Note: Repair and repaint the surface.



    Illustration 2g06426483


    Illustration 3g06426541
    Detail view of A
    (D1) 171.3 mm (6.74 inch)
    (D2) 104.8 mm (4.13 inch)
    (D3) 742.5 mm (29.23 inch)
    (D4) 700.5 mm (27.58 inch)
    (D5) 544 mm (21.4 inch)
    (D6) 447.5 mm (17.62 inch)
    (D7) 392.2 mm (15.44 inch)
    (D8) 332.2 mm (13.08 inch)

  2. Drill four holes of diameter 18 mm (0.7 inch) on the plate as shown in Illustration 3 and Illustration 2.


    Illustration 4g06426618
    (1) 578-5758 Shim
    (2) 118-5805 Special Race Bearing
    (3) 487-5859 Position Sensor Gp
    (4) 240-6577 Threaded Rod
    (5) 487-5860 Position Sensor
    (6) 469-2140 Spacer
    (7) 578-0959 Sheave

    Note: If completed 578-0957 Mounting Bracket Gp is not received, perform procedure to assemble 578-0957 Mounting Bracket Gp.

    Note: The retaining ring should be towards the sheave shoulder.

    Note: To press the bearing onto the sheave shaft only apply force to the internal ring of the bearing. Continue to press until the bearing contacts the sheave shoulder

    Note: Apply Blue Loctite on both sides of threaded rod (4) (Loctite 242) and hand tighten threaded rod (4) and position sensor (5).

  1. Install sheave (7) with bearing (2), shim packs (1), position sensor (3), threaded rod (4)( 40 ± 1.5 mm (1.6 ± 0.06 inch)), position sensor (5), and spacer (6) to 578-0957 Mounting Bracket Gp.

    Connect the hoist cable.

    Reference: Testing and Adjusting, M0074458, "Mast - Test and Adjust - Hoist Pulldown Auto Tension"



Illustration 5g06422127
After rework

Rework Instruction for 578-2449

Location of Rework



Illustration 6g06420209

Required Parts

Table 2
Required Parts 
Item  Qty  Part Number  Part Name 
578-1843  Hose As 
004-6683  Fitting 
468-3120  Injector As 
3J-5390  Plug 
148-8320  Connector As 
148-8351  Elbow As 
420-0939  Spacer 
578-1841  Hose As 
10  5P-9299  Clip 
10  8T-4136  Bolt 
11  12  8T-4121  Hard Washer 
12  344-5675  Nut 
13  144-8344  Spacer 
14  8T-4182  Bolt 
15  10  2R-1939  Clip 
16  8Y-3795  Boss 
17  205-7299  Clip 
18  8T-4137  Bolt 
19  204-2281  Cable Strap 

Rework Procedure



    Illustration 7g06418605
    View of 561-7999 Automatic Lubrication Lines Gp
    (A) 533-6084 Hose As

  1. Remove and discard hose assembly (A) from the eighth injector of automatic lubrication lines group.


    Illustration 8g06418642
    View of 561-7999 Automatic Lubrication Lines Gp
    (1) 578-1843 Hose As

  2. Install hose assembly (1) to eighth injector of automatic lubrication lines group.


    Illustration 9g06419401
    (2) 004-6683 Fitting
    (3) 468-3120 Injector As
    (4) 3J-5390 Plug
    (5) 148-8320 Connector As
    (6) 148-8351 Elbow As
    (7) 420-0939 Spacer

  3. Install injector assembly (3) to 269-5352 Lubrication Distribution Valve Gp using fitting (2).

  4. Install plug (4), connector assembly (5), elbow adapter (6), and spacer (7) on injector assembly (3). Refer to Illustration 9.


    Illustration 10g06419408
    (8) 578-1841 Hose As

  5. Install one end of hose assembly (8) to injector (3).


    Illustration 11g06419418
    (B) 513-1672 Hose As
    (8) 578-1841 Hose As
    (9) 5P-9299 Clip
    (10) 8T-4136 Bolt
    (11) 8T-4121 Hard Washer
    (12) 344-5675 Nut

  6. Secure hose assembly (8) with hose assembly (B) using two clips (9), bolt (10), two washers (11), and nut (12).


    Illustration 12g06419447
    (9) 5P-9299 Clip
    (11) 8T-4121 Hard Washer
    (13) 144-8344 Spacer
    (14) 8T-4182 Bolt

  7. Secure 578-1841 Hose As using clip (9), washer (11), spacer (13), and bolt (14) in two locations.


    Illustration 13g06419495
    (9) 5P-9299 Clip
    (15) 2R-1939 Clip

  8. Secure 578-1841 Hose As using clip (9) and clip (15).


    Illustration 14g06419531
    (D1) 630 mm (24.8 inch)
    (D2) 481 mm (18.9 inch)
    (W1) 2 x 6 mm (0.2 inch) all-around fillet weld
    (16) 8Y-3795 Boss

  9. Weld two bosses (16) on the 507-5688 Tube as per dimension shown in Illustration 14.


    Illustration 15g06419580
    (1) 578-1843 Hose As
    (8) 578-1841 Hose As
    (9) 5P-9299 Clip
    (11) 8T-4121 Hard Washer
    (16) 8Y-3795 Boss
    (17) 8t-4195 Bolt

  10. Secure hose (8) using three clips (9), two washers (11), and two bolts (17) to boss (16).

  11. Route hose (1) to the top of machine as shown in Illustration 15.


    Illustration 16g06419666
    (8) 578-1841 Hose As
    (11) 8T-4121 Hard Washer
    (17) 205-7299 Clip
    (18) 8T-4137 Bolt

  12. Secure hose (8) with two clips (17), two hard washers (18), and two bolts (18) in two locations.


    Illustration 17g06419839
    (1) 578-1843 Hose As
    (8) 578-1841 Hose As
    (15) 2R-1939 Clip


    Illustration 18g06419852
    (1) 578-1843 Hose As
    (8) 578-1841 Hose As
    (15) 2R-1939 Clip

  13. Remove the existing 9M-4995 Clip, and secure hose (1) with hose (8) using four clips (15) in three locations as shown in Illustration 17.


    Illustration 19g06419885
    (1) 578-1843 Hose As
    (8) 578-1841 Hose As
    (15) 2R-1939 Clip
    (19) 204-2281 Cable Strap

  14. Secure hose (1) with hose (8) using clip (15) and cable strap (19).


    Illustration 20g06419903
    Top of mast
    (16) 8Y-3795 Boss
    (D3) 463 mm (18.2 inch)
    (D4) 22.5 mm (0.88 inch)
    (D5) 395 mm (15.5 inch)
    (D6) 357 mm (14.1 inch)
    (W2) 2 x 6 mm (0.2 inch) all-around fillet weld

  15. Weld two bosses (16) as per the dimensions on plate shown in Illustration 20.


    Illustration 21g06419956
    (1) 578-1843 Hose As
    (5) 148-8320 Connector As
    (8) 578-1841 Hose As
    (9) 5P-9299 Clip
    (10) 8T-4136 Bolt
    (11) 8T-4121 Hard Washer
    (15) 2R-1939 Clip

    Note: The bearing cavities must be manually filled with grease and the newly installed grease line must be purged prior to connecting to the sheave assembly. Use 6H-9049 Fitting to fill grease manually.

  16. Install hose assembly (1) and hose (8) to bracket assembly using two adapters (5).

  17. Secure hose assembly (1) with hose (8) using clip (15). Refer to Illustration 21.

  18. Secure hose assembly (1) to welded boss (16) using clip (9), bolt (10), and washer (11). Refer to Illustration 21.

    Secure hose assembly (8) to welded boss (16) using clip (9), bolt (10), and washer (11). Refer to Illustration 21.

Rework Procedure for 578-5229 Sensor Wiring Gp

Location of Rework



Illustration 22g06422343

Table 3
Required Parts 
Item  Qty  Part Number  Part Name 
578-5211  Box Harness As 
136  7K-1181  Cable Strap 
578-5212  Valve Harness As 
578-5213  Wiring Harness 
578-5225  Wiring Harness 
578-5216  Cable As 
9R-3761  Boss 
578-4259  Plate 
8T-4121  Hard Washer 
10  8T-4136  Bolt 
11  521-1761  Position Sensor Gp 
12  242-7386  Washer 
13  8T-0289  Bolt 
14  3T-0851  Locknut 
15  578-5226  Wiring Harness 
16  9R-3761  Boss 
17  578-4259  Plate 
18  200-6345  Mounting Saddle 
19  578-4292  Plate 


    Illustration 23g06420250
    (1) 578-5211 Box Harness As
    (2) 7K-1181 Cable Strap

  1. Install box harness (1) to 507-9074 Enclosure Ar.

  2. Secure harness (1) with 574-9663 Box Harness As using five cable straps (2). Refer to Illustration 23.


    Illustration 24g06420279
    (1) 578-5211 Box Harness As
    (2) 7K-1181 Cable Strap


    Illustration 25g06420300
    Circuit Diagram

  3. Connect the wires of harness (1) as:

    • Connect the M906-ED9-BU(Blue)wire to PIN43 of EL-C175.

    • Connect the M908-ED10-YL(Yellow)wire to PIN49 of EL-C175.

    • Connect the M909-ED11-GN(Green)wire to PIN50 of EL-C175.

    • Connect the N997-ED12-WH(White)wire to PIN41 of EL-C175.

    • Connect the N998-ED13-OR(Orange)wire to PIN42 of EL-C175.


    Illustration 26g06420475
    (A) 155-2269 Connector Plug As
    (B) 3E-3364 Receptacle
    (1) 578-5211 Box Harness As
    (2) 7K-1181 Cable Strap


    Illustration 27g06420750

  4. Connect the wires of harness (1) as:

    • Remove J844-GY(Grey)wire from EL-C172 PIN 69.

    • Remove J843-BK(Black)wire EL-C172 PIN 56

    • Connect the J844-ED2-GY(Grey)wire to PIN 69 of EL-C172.

    • Connect the J843-ED5-BK(Black)wire to PIN56 of EL-C172.

    • Connect the T997-ED7-OR(Orange)wire to PIN11 of EL-C172.

    • Connect the T998-ED8-BR(Brown)wire to PIN21 of EL-C172.


    Illustration 28g06420760
    (1) 578-5211 Box Harness As
    (2) 7K-1181 Cable Strap


    Illustration 29g06420763

  5. Connect the wires of harness (1) as:

    • Connect J844-ED3-GY(Grey)wire to EL-C2 PIN 100.

    • Connect J843-ED6-BK(Black)wire to EL-C2 PIN 101

    • Connect T997-ED7-OR(Orange)wire to EL-C2 PIN 110

    • Connect T998-ED8-BR(Brown)wire to EL-C2 PIN 111

    • Connect M906-ED9-BU(Blue)wire to EL-C2 PIN 104

    • Connect M908-ED10-YL(Yellow)wire to EL-C2 PIN 105

    • Connect M909-ED11-GN(Green)wire to EL-C2 PIN 106

    • Connect N997-ED12-WH(White)wire to EL-C2 PIN 112

    • Connect N998-ED13-OR(Orange)wire to EL-C2 PIN 113


    Illustration 30g06420847
    (3) 578-5212 Valve Harness As
    (4) 7K-1181 Cable Strap


    Illustration 31g06420860

  6. Install one end of harness (3) to 264-5732 Connector Plug As of 507-9074 Enclosure Ar.

    Connect the wires of harness (3) as:

    • Connect J884-VD1-GY(Grey)wire to V-C520 PIN100

    • Connect J843-VD2-BK(Black)wire to V-C520 PIN101

    • Connect T997-VD3-OR(Orange)wire to V-C520 PIN110

    • Connect T998-VD4-BR(Brown)wire to V-C520 PIN111

    • Connect M906-VD5-BU(Blue)wire to V-C520 PIN104

    • Connect MD908-VD6-YL(Yellow)wire to V-C520 PIN105

    • Connect M909-VD7-GN(Green)wire to V-C520 PIN106

    • Connect N997-VD8-WH(White)wire to V-C520 PIN112

    • Connect N998-VD9-OR(Orange)wire to V-C520 PIN113


    Illustration 32g06420887
    (3) 578-5212 Valve Harness As
    (2) 7K-1181 Cable Strap
    (C) 549-7674 Valve Harness As

  7. Secure harness (3) with valve harness (C) using 17 cable straps (4).


    Illustration 33g06420902
    (3) 578-5212 Valve Harness As
    (2) 7K-1181 Cable Strap


    Illustration 34g06420910

  8. Connect another end of harness (3) to 224-2734 Connector Receptacle As.

    Connect the wires of harness (3) as:

    • Connect J884-VD1-GY(Grey)wire to V-C16 PIN 48

    • Connect J843-VD2-BK(Black)wire to V-C16 PIN 49

    • Connect T997-VD3-OR(Orange)wire to V-C16 PIN 50

    • Connect T998-VD4-BR(Brown)wire to V-C16 PIN 51

    • Connect M906-VD5-BU(Blue)wire to V-C16 PIN 58

    • Connect M908-VD6-YL(Yellow)wire to V-C16 PIN 59

    • Connect M909-VD7-GN(Green)wire to V-C16 PIN 60

    • Connect M906-VD5-BU(Blue)wire to V-C16 PIN 61

    • Connect N998-VD9-OR(Orange)wire to V-C16 PIN 62


    Illustration 35g06421382
    (2) 7K-1181 Cable Strap
    (4) 578-5213 Wiring Harness
    (C) 574-9669 Wiring Harness


    Illustration 36g06421385

  9. Install one end of harness (4) to 160-7689 Connector Plug As.

    Connect the wires of harness (4) as:

    • Connect J844-JD1-GY(Grey)wire to MJ-C6 PIN48

    • Connect J843-JD2-BK(Black)wire to MJ-C6 PIN49

    • Connect T997-JD3-OR(Orange)wire to MJ-C6 PIN50

    • Connect T998-JD4-BR(Brown)wire to MJ-C6 PIN51

    • Connect M906-JD5-BU(Blue)wire to MJ-C6 PIN58

    • Connect M908-JD6-YL(Yellow)wire to MJ-C6 PIN59

    • Connect M909-JD7-GN(Green)wire to MJ-C6 PIN60

    • Connect N997-JD8-WH(White)wire to MJ-C6 PIN61

    • Connect N998-JD9-OR(Orange)wire to MJ-C6 PIN62


    Illustration 37g06421389
    (2) 7K-1181 Cable Strap
    (4) 578-5213 Wiring Harness
    (C) 574-9669 Wiring Harness

  10. Secure harness (4) with mast flex harness (C) using six clips (2).


    Illustration 38g06421394
    (2) 7K-1181 Cable Strap
    (4) 578-5213 Wiring Harness
    (C) 574-9669 Wiring Harness

  11. Connect another end of harness (4) to 160-7689 Connector Plug As.

    Connect the wires of harness (4) as:

    • Connect J844-JD1-GY(Grey)wire to MJ-C2 PIN48

    • Connect J843-JD2-BK(Black)wire to MJ-C2 PIN49

    • Connect T997-JD3-OR(Orange)wire to MJ-C2 PIN50

    • Connect T998-JD4-BR(Brown)wire to MJ-C2 PIN51

    • Connect M906-JD5-BU(Blue)wire to MJ-C2 PIN58

    • Connect M908-JD6-YL(Yellow)wire to MJ-C2 PIN59

    • Connect M909-JD7-GN(Green)wire to MJ-C2 PIN60

    • Connect N997-JD8-WH(White)wire to MJ-C2 PIN61

    • Connect N998-JD9-OR(Orange)wire to MJ-C2 PIN62


    Illustration 39g06421414
    (F) 549-7694 Wiring Harness
    (2) 7K-1181 Cable Strap
    (5) 578-5225 Wiring Harness


    Illustration 40g06421425

  12. Install one end of harness (5) to 224-2734 Connector Receptacle As.

    Connect the wires of harness (5) as:

    • Connect J844-MD1-GY(Grey)wire to M-C413 PIN48

    • Connect J843-MD5-BK(Black)wire to M-C413 PIN49

    • Connect T997-MD9-OR(Orange)wire to M-C413 PIN50

    • Connect T998-MD10-BR(Brown)wire to M-C413 PIN51

    • Connect M906-MD11-BU(Blue)wire to M-C413 PIN58

    • Connect M908-MD12-YL(Yellow)wire to M-C413 PIN59

    • Connect M909-MD13-GN(Green)wire to M-C413 PIN60

    • Connect N997-MD14-WH(White)wire to M-C413 PIN61

    • Connect N998-MD15-OR(Orange)wire to M-C413 PIN62


    Illustration 41g06421460
    (F) 549-7694 Wiring Harness
    (2) 7K-1181 Cable Strap
    (5) 578-5225 Wiring Harness

  13. Secure harness (5) with wiring harness (F) using 25 clips, as shown in Illustration 41.


    Illustration 42g06421483
    (D1) 40 mm (1.5 inch)
    (D2) 1760 mm (69.3 inch)
    (H) MB-C2 connector
    (2) 7K-1181 Cable Strap
    (5) 578-5225 Wiring Harness
    (6) 578-5216 Cable As

    Note: The dimension (D2) should be measured from mast base plate to bottom proxy switch mounting boss.



    Illustration 43g06421512
    Detail view of G
    (W1) 2 x 6 mm (0.2 inch) all-around fillet weld
    (7) 9R-3761 Boss
    (8) 578-4259 Plate
    (9) 8T-4121 Hard Washer
    (10) 8T-4136 Bolt
    (11) 521-1761 Position Sensor Gp
    (12) 242-7386 Washer
    (13) 8T-0289 Bolt
    (14) 3T-0851 Locknut


    Illustration 44g06421672
    Section J-J
    (D3) 2 x 65.9 mm (2.6 inch)

  14. Connect harness (5) to MB-C2 connector.

    Secure MB-C2 harness connector (H) with harness (5) using clip as shown in Illustration 42.

  15. Connect one end of cable assembly (6) to MB-C2 connector (H). Refer to Illustration 42.

  16. Weld two bosses (7) to 526-2215 Tube as per the dimensions shown in Illustration 42, Illustration 44, and Illustration 43.

    Install plate (8) to boss (7) with four washers (12), two bolts (13), and two nuts (14), as shown in Illustration 43.

  17. Install position sensor (11) to plate (8) using two washers (9) and two bolts (10) as shown in Illustration 43.

  18. Connect another end of cable assembly (6) to position sensor (11). Refer to Illustration 43.


    Illustration 45g06421532
    (F) 549-7694 Wiring Harness
    (2) 7K-1181 Cable Strap
    (5) 578-5225 Wiring Harness


    Illustration 46g06421553
    (F) 549-7694 Wiring Harness
    (2) 7K-1181 Cable Strap
    (5) 578-5225 Wiring Harness

  19. Secure and route harness (5) with harness (5) using 44 clips towards the crown.


    Illustration 47g06421626
    (K) connector (MB-C1 mate with MT-C1)
    (2) 7K-1181 Cable Strap
    (5) 578-5225 Wiring Harness
    (15) 578-5226 Wiring Harness

  20. Connect harness (5) to MB-C1 and mate with MT-C1.

    Secure connector (K) (MB-C1 mate with MT-C1) with 549-7694 Wiring Harness using clip (2).



    Illustration 48g06421664
    (W2) 2 x 6 mm (0.2 inch) all-around fillet weld
    (D4) 11918 mm (469.2 inch)
    (D5) 40 mm (1.6 inch)
    (D6) 105 mm (4.1 inch)
    (D7) 188 mm (7.4 inch)
    (5) 578-5225 Wiring Harness
    (6) 578-5216 Cable As
    (9) 8T-4121 Hard Washer
    (10) 8T-4136 Bolt
    (11) 521-1761 Position Sensor Gp
    (12) 242-7386 Washer
    (13) 8T-0289 Bolt
    (14) 3T-0851 Locknut
    (16) 9R-3761 Boss
    (17) 578-4259 Plate

    Note: The dimension (D4) should be measured from mast base plate to bottom proxy switch mounting boss.



    Illustration 49g06421515
    Section L-L
    (D8) 2 x 65.9 mm (2.6 inch)

  21. Connect harness (5) to MB-C3 connector.

    Connect one of cable assembly (6) to MB-C3 connector.

  22. Weld two bosses (16) as per the dimensions shown in Illustration 48 and Illustration 49.

    Install plate (17) to boss (16) using four washers (12), two bolts (13), and two nuts (14). Refer to Illustration 48.

  23. Install position sensor (11) to plate (17) using two washers (9) and two bolts (10). Refer to Illustration 48.

    Connect another end of cable assembly (6) to position sensor (11). Refer to Illustration 48.



    Illustration 50g06421793
    (M) 580-1187 Wiring Harness
    (2) 7K-1181 Cable Strap
    (15) 578-5226 Wiring Harness

  24. Secure and route harness (15) with mast harness (M) with 13 clips (2).

    Note: Excess length of harness (15) should tie with mast harness (M) using clips.



    Illustration 51g06421822
    (M) 580-1187 Wiring Harness
    (2) 7K-1181 Cable Strap
    (15) 578-5226 Wiring Harness
    (18) 200-6345 Mounting Saddle

  25. Secure and route harness (15) with harness (M) using eight clips (2) and two mounting swivels towards the crown. Refer to Illustration 51.

  26. Connect harness (15) to 578-0957 Mounting Bracket Gp. Refer to Illustration 51.


    Illustration 52g06422017
    Installation of target plate
    (W3) 2 x 6 mm (0.2 inch) all-around fillet weld
    (D9) 141 mm (5.5 inch)
    (D10) 100 mm (3.9 inch)
    (D11) 25 mm (1.0 inch)
    (16) 9R-3761 Boss

  27. Weld two bosses (16) as per the dimensions shown in Illustration 52.


    Illustration 53g06422020
    (9) 8T-4121 Hard Washer
    (10) 8T-4136 Bolt
    (19) 578-4292 Plate

  28. Install plate (19) to welded boss with two washers (9) and two bolts (10).


    Illustration 54g06422071
    (P) 566-5662 Position Sensor Gp
    (R) 524-5322 Cable As

  29. Remove and discard position sensor (P) and cable assembly (R).

New Encoder Calibration and Troubleshooting

Depth Measurement

The normal process for depth processing is as follows:

  1. At key-ON we read from memory the last known head position to use as the start point.

  2. The rotary encoder reads the position of one top cable sheave and calculates the motion of the rotary head.

  3. After the rotary head passes each proximity switch the position is adjusted to be more accurate.

  4. At key-OFF the position will be saved into memory.

The proximity switches are placed before the head reaches important locations:

  • Pipe in the hole for two pipe masts (optional switch).

  • Head clear of carousel and pipe in the hole for one pipe masts.

  • Head near deck wrench.

Diagnostics

The sheave encoder has diagnostics for open and short to ground diagnostics. If there is a failure, all interlocks that use head position are activated and they will need to be manually overridden.

  • If a failure is detected with duty cycle (raw input from sensor), head above carousel, head cleared to positioner and pipe not in hole interlocks will be activated. The operator will need to override these to perform related operations.

  • If a failure is detected with all the proximity switches (that are part of the depth system based on machine configuration), head above carousel, head cleared to positioner and pipe not in hole interlocks will be activated. The operator will need to override these to perform related operations.

  • If a failure is detected with one (any) proximity switch (that is part of the depth system based on machine configuration), automatic pipe handling will not work.

The proximity switches have short to ground diagnostics to avoid improper position corrections.

Component Detail

The sheave sensor uses hall effect technology that senses a magnet that is attached to the sheave.

The proximity switches are typical proximity switches that are mounted on the mast and will read the target mounted on the rotary head guides.

1st Time Calibration

To calibrate the head position the rotary head needs to be moved up or down past one of the proximity switches. Once the proximity switch is flagged the calibration is complete. There is no longer a need to calibrate through the operator display. Those buttons may be present in current software but will be removed shortly. You may have an event stating that top of mast calibration is required, this will be removed from software as well in a future release.

Verify ET settings

  • It is important to verify mast length and pipe length settings in ET are correct for the machine’s configuration. These are critical for the new software.

Depth System Configuration MD6250

  • 13.6 m (44.62 ft) mast and 10668 mm (420.0 inch)

New Encoder Calibration 13.6 m (44.62 ft) Mast with 10.7 m (35.11 ft) Pipe Size

  1. Install CAT Electronic Technician 2019B provided directly from the Drill product group.


    Illustration 55g06425807


    Illustration 56g06425822

  2. Connect to ET and go to configuration page.

    • Connect via common adapter.

    • Go to configuration page in ET.


    Illustration 57g06425859

  3. Mast Configuration

    • Set mast length to 13.6 m (44.62 ft).

    • Set pipe length configuration to 6096 mm (20.0 ft).

Electrical Troubleshooting

Table 4
Required Tool List 
Qty  Part Name 
Multimeter (1) 
(1) ability to read duty cycle.


Illustration 58g06420279

  • Connect the M906-ED9-BU(Blue)wire to PIN43 of EL-C175 - signal from proximity switch, should read 5V when target not detected and 1.3V when target is detected.

  • Connect the M908-ED10-YL(Yellow)wire to PIN49 of EL-C175 - signal from proximity switch, should read 5V when target not detected and 1.3V when target is detected.

  • Connect the M909-ED11-GN(Green)wire to PIN50 of EL-C175 - signal from proximity switch, should read 5V when target not detected and 1.3V when target is detected.

  • Connect the N997-ED12-WH(White)wire to PIN41 of EL-C175 Pin 3 on Encoder Sig 1 (This should see 5 to 95% duty Cycle when head is moving) against the ground).

  • Connect the N998-ED13-OR(Orange)wire to PIN42 of EL-C175 Pin 4 on Encoder Sig 2(This should see 5 to 95% duty Cycle when head is moving) against the ground).

Note: Mast that are 13.6 m (44.62 ft) with 35ft carousel should use only M906 and M908.



Illustration 59g06420475

  • Remove J844-GY(Grey)wire from EL-C172 PIN 69.

  • Remove J843-BK(Black)wire EL-C172 PIN 56

  • Connect the J844-ED2-GY(Grey)wire to PIN 69 of EL-C172.

  • Connect the J843-ED5-BK(Black)wire to PIN56 of EL-C172.

  • Connect the T997-ED7-OR(Orange)wire to PIN11 of EL-C172 - Pin 1 on Encoder vs (needs to read 5V).

  • Connect the T998-ED8-BR(Brown)wire to PIN21 of EL-C172 - Pin 2 on Encoder ground.

Caterpillar Information System:

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