Case 621G Wheel Loader Service Parts Catalogue (531114621PC)

Case 621G Wheel Loader Service Parts Catalogue (531114621PC) (August 2025)

A 621G wheel loader usually lives in the rough stuff—quarries, feed yards, snow work, pipe jobs—where downtime costs real money. This service parts catalogue doesn’t teach you how to wrench; it helps you plan the job so you’ve got every seal, pin, and bushing on the bench before you pull a single hose. Say you’re tracing a hydraulic leak at the boom cylinder: with this, you can match the rod-end gland, wiper, and backup rings off the exploded view and order once, not three times.

Applications & Use Cases

• Pre-loading your parts shelf before a major service; you trace each system in the diagram and build a pick list so the machine’s only down while you actually turn wrenches.
• Verifying the right revision of hoses, tubes, and fittings when you inspect a routed line and see a superseded part number stamped on the crimp.
• Isolating similar bushings and pins during teardown so you don’t mix them up; you match suffixes to the diagram instead of guessing by eye.
• Planning rebuild kits for cylinders, axles, or the linkage by checking every o‑ring and wear ring you’ll disturb when you open it up.
• Checking optional equipment—quick coupler, extra hydraulics, guards—so you order parts that actually fit the way your loader is spec’d.

FAQ

Q: Is this a searchable PDF, or just scanned pages?

A: It’s typically a proper digital catalogue, so you can search by part number or description, then confirm visually with the exploded view.

Q: Can I print just the sections I need to take to the jobsite?

A: Yes, most folks print the systems they’re working on, stick them in a sleeve, and mark them up as they test, remove, and replace parts.

Safety Note

Before you inspect or remove any component you’ve identified in the catalogue, verify the loader is blocked, pressure bled off, and everything is safely supported.

Case 621G Wheel Loader Index:

05.100.AA [01] INITIAL STOCKING LIST (LIST A)
05.100.BB [01] INITIAL STOCKING LIST (LIST B)
10.001.AD ENGINE; (Var) 734890001
10.001.AK ENGINE INSTALLATION; (Var) 734890001
10.216.AI [02] FUEL TANK; (Var) 734890001
10.400.AT COOLER INSTALLATION, STANDARD; (Var) 482585153
10.400.AT COOLER TOP SCREEN INSTALLATION, STANDARD; (Var) 482585153
10.400.BE [01] COOLING SYSTEM LINE INSTALLATION; (Var) 482585153
10.500.AA [01] DEF/ADBLUE LINES; (Var) 734890001
10.500.AA [03] DEF TANK INSTALLATION; (Var) 734890001
10.500.AI DEF COVERS; (Var) 482322351
10.500.AO MUFFLER AND EXHAUST SYSTEM; (Var) 734890001
21.000.AA TRANSMISSION, PL12 4SP EC4; (Var) 424224153
21.100.AN PRESSURE REGULATOR; (Var) 424224153
21.105.BC FILTER, HYD OIL; (Var) 424224153
21.105.BK PUMP, LUBE, TRANSMISSION CHARGE; (Var) 424224153
21.113.AD HOUSING, TRANSMISSION; (Var) 424224153
21.113.AF DIPSTICK, OIL; (Var) 424224153
21.113.AI HOUSING,TRANSMISSION BREATHER; (Var) 424224153
21.113.AT INPUT ASSY, TRANSMISSION; (Var) 424224153
21.130.AZ CONTROLLER ASSY, EC4; (Var) 424224153
21.130.BF SENSOR, SPEED AND TEMP; (Var) 424224153
21.130.BF [01] COVER, EMERGENCY STEERING PUMP; (Var) 424224153
21.135.AL VALVE,CONTROL,TRANSMISSION; (Var) 424224153
21.135.AQ VALVE,CONTROL,MANIFOLD; (Var) 424224153
21.135.AR SWITCH,PRESSURE,FILTER RESTRICTION; (Var) 424224153
21.135.AX SHAFT ASSY, PTO; (Var) 424224153
21.155.AN [01] SHAFT ASSY, K1; (Var) 424224153
21.155.AN [02] SHAFTASSY, K2; (Var) 424224153
21.155.AN [03] SHAFTASSY, K3; (Var) 424224153
21.155.AN [04] SHAFT ASSY, K4; (Var) 424224153
21.155.AN [05] SHAFT ASSY, KV; (Var) 424224153
21.155.AN [06] SHAFTVASSY,VKR; (Var) 424224153
21.155.AY SHAFT ASSY, OUTPUT FLANGE; (Var) 424224153
21.155.AY [01] SHAFT ASSY, OUTPUT; (Var) 424224153
21.300.AG [02] DRIVE SHAFT INSTALLATION; (Var) 734890001
21.700.AA TORQUE CONVERTER; (Var) 424224153
21.700.AA [01] HOUSING ASSY, CONVERTER INPUT; (Var) 424224153
21.700.AA [02] FLANGE, INPUT; (Var) 424224153
25.100.AA FRONT AND REAR DIFFERENTIAL INSTALLATION, DIFF LOCK; (Var) 424235251
25.100.AD AXLE HOUSING AND DRIVE, STANDARD AND HEAVY DUTY; (Var) 424235251
25.102.AD HEAVY DUTY FRONT AND REAR AXLE INSTALLATION; (Var) 424235251
25.300.AA DIFFERENTIAL ASSEMBLY, HEAVY DUTY; (Var) 424235251
27.100.AB AXLE HOUSING AND DRIVE; (Var) 424235251
27.100.AK FRONT AND REAR DIFFERENTIAL INSTALLATION, DIFF LOCK; (Var) 424235251
33.110.AM BRAKE,PARKING; (Var) 424224153
33.110.AX BRAKE, PARKING, OUTPUT FLANGE; (Var) 424224153
33.202.AP BRAKE LINE INSTALLATION, STANDARD AND HEAVY DUTY AXLES; (Var) 424235251
33.202.AX FRONT AND REAR AXLE BRAKE ASSEMBLY, HEAVY DUTY; (Var) 424235251

33.202.AX HEAVY DUTY BRAKE LINE; (Var) 402168001
33.202.CM BRAKE CONTROL VALVE INSTALLATION; (Var) 424224153
33.202.CM [02] BRAKE CONTROL VALVE COMPONENTS; (Var) 424224153
33.202.CM [05] BRAKE VALVE, 4 SPEED EC4, PL10-20; (Var) 424224153
33.202.CT [03] BRAKE PUMP AND PLUMBING, PL12_part 1; (Var) 424224153
33.202.CT [04] BRAKE PUMP AND PLUMBING, PL12_part 2; (Var) 424224153
35.100.AB LINE LIFT & TILT, Z-BAR; (Var) 734117063
35.300.AD BLOCK, FASTENER 2 & 4 BLOCK; (Var) 402011001
35.357.AA [02] CONTROL VALVE LINE – 3 SPOOL, EH; (Var) 734054263
35.359.AB CONTROL VALVE, MOUNTING – 3 SPOOL, Z-BAR / XR / LR; (Var) 734054263
35.359.AB [10] CONTROL VALVE, COMPONENTS; (Var) 734054263
35.359.AB [11] CONTROL VALVE, COMPONENTS; (Var) 734054263
35.359.AB [12] CONTROL VALVE, COMPONENTS; (Var) 734054263
35.405.AB LOCKING PLUG, HYDRAULIC ACCESSORY LINE; (Var) 402146001
35.701.AA [01] RIDE CONTROL; (Var) 782503113
35.701.AD [01] THIRD SPOOL AUXILIARY LINE INSTALLATION, Z BAR; (Var) 734054263
35.733.AC COOLER INSTALLATION; (Var) 402146001
35.734.AC [04] QUICK COUPLER, VALVE, LINE; (Var) 424911131
35.752.AG THERMAL BYPASS VALVE INSTALLATION; (Var) 482585153
39.100.AH BATTERY AND SCR COVERS; (Var) 734890001
39.100.AH REMOTE DRAIN COVER; (Var) 782897013
39.100.AH [010] COOLING FRAME; (Var) 734890001
39.100.AH [012] COOLING FRAME; (Var) 734890001
39.100.AI FRAME, REAR COVER; (Var) 782897013
39.100.AN ARTICULATION JOINT; (Var) 734890001
39.100.AS REAR CHASSIS CE GREY; (Var) 734890001
39.105.AM [01] LIFT ARM INSTALLATION, Z-BAR; (Var) 734114281
39.140.AM [01] COUNTERWEIGHT, HEAVY DUTY; (Var) 482059013
41.101.AJ STEERING COLUMN COVER INSTALLATION; (Var) 734064011
50.100.AP HEATER W/ A/C ASSEMBLY; (Var) 782440153
50.100.AP VAR – 782440 – HEATER INSTALLATION W/ A/C; (Var) 782440153
50.100.AQ CAB HEATER HOSE; (Var) 782440153
50.200.AK AIR CONDITIONING CONDENSER; (Var) 782440153
55.024.AA HARNESS, WIRE TRANSMISSION; (Var) 424224153
55.100.BZ [02] ENGINE AND REAR CHASSIS HARNESS INSTALLATION; (Var) 734890001
55.101.AA ENGINE AND REAR CHASSIS HARNESS ASSEMBLY; (Var) 734890001
55.101.AC [03] I, HARNESS FRONT CHASSIS, Z-BAR; (Var) 734114281
55.201.AE ENGINE STARTER INSTALLATION; (Var) 734890001
55.202.AA GRID HEATER INSTALL; (Var) 482322351
55.202.AE CYLINDER BLOCK HEATER, 750W; (Var) 482322351
55.301.AA [01] ALTERNATOR PULLEY, BELT AND BRACKET INSTALLATION, W/ A/C; (Var) 782440153
55.404.BM REAR LIGHT INSTALLATION; (Var) 734133113
55.404.BS WORK LIGHT, CAB, 4 FRONT, 2 REAR; (Var) 734133113
55.415.AR ELECTROHYDRAULIC SENSOR, LIFT AND TILT, Z-BAR/XR; (Var) 734890001
55.510.AF [01] CAB MAIN WIRE HARNESS INSTALLATION; (Var) 734064011
55.510.AH [01] CAB ROOF HARNESS INSTALLATION; (Var) 734064011
55.512.AA RADIO INSTALLATION; (Var) 482134003
55.518.AT WASHER BOTTLE BOX COVER; (Var) 782897013
55.518.AT WASHER BOTTLE INSTALLATION; (Var) 734064011,782440153,782777003
TABLE OF CONTENTS
55.530.AA [01] REAR VIEW CAMERA; (Var) 424234033
55.642.AA [01] EVOLUTION CONTROL MONITOR, DISPLAY; (Var) 734064011
55.988.AD SCR HARNESS INSTALLATION; (Var) 734890001
55.990.AC [01] HOOD HARNESS INSTALLATION; (Var) 734890001
55.991.AD [01] TELEMATIC SYSTEM; (Var) 734040011
55.991.AD [02] TELEMATIC SYSTEM; (Var) 734168001
82.100.BG LIFT ARM PIN, Z BAR LIFT ARM AND XR/LR; (Var) 782537291
88.100.025 DIA KIT, TIRE PRESSURE MONITORING SYSTEM – TPMS
88.100.035 DIA KIT, 621G XT, 4TH SPOOL CONVERSION KIT
88.100.035 [23] DIA KIT, JOYSTICK STEERING W/ STANDARD HYDRAULIC STEERING
88.100.035 [24] DIA KIT, JOYSTICK STEERING W/ SECONDARY ELECTRIC STEERING
88.100.039 [05] DIA KIT, WINDSHIELD GUARD XT
88.100.04 ACCESSORY MOUNTING POLE
88.100.140 DIA KIT, RADIO
88.100.33 [01] DIA KIT, RIGHT HAND BRAKE PEDAL
88.100.35 [04] DIA KIT, ACCESSORY LINE, XT
88.100.35 [07] DIA KIT, FIELD RIDE CONTROL CONVERSION
88.100.35 [15] DIA KIT, LOCKING HYDRAULICS, ZB/XR
88.100.35 [25] DIA KIT, WEIGH LOAD, PL10-12
88.100.35 [27] ACCESSORIES, LINE XR/LR
88.100.39 [02] DIA KIT, SKID AND FUEL TANK GUARDS
88.100.39 [04] DIA KIT, FIELD SKID PLATE
88.100.39 [07] DIA KIT, WINDSHIELD GUARD, ZBAR,XR
88.100.39 [085] DIA KIT, DRIVING LIGHT GUARDS
88.100.39 [09] DIA KIT, REAR FRAME SIDE COVER
88.100.55 [05] DIA KIT, COLD WEATHER PACKAGE
88.100.55 [075] DIA KIT, PRINTER WEIGH LOAD
88.100.55 [09] DIA KIT, TELEMATIC SYSTEM, VERIZON
88.100.55 [10] DIA KIT, TELEMATIC SYSTEM, VODAFONE
88.100.82 DIA KIT, JRB COMP XT COUPLER
88.100.82 [01] DIA KIT, ACS COMP ZBAR, /XR/LR COUPLER
88.100.90 [01] CAB ROOF, KIT; (Var) 734064011
88.130.010 FIRE EXTINGUISHER
88.130.10 FIRE EXTINGUISHER
88.130.20 [02] DIA KIT, LEVER 2FH 2FN JOYSTICK EH
88.130.20 [03] DIA KIT, LEVERS – 3 FN JOYSTICK, EH
88.130.20 [04] DIA KIT, LEVER 2FH 3FN LEVER EH
88.130.20 [04] KIT, SPOOL ADD PL1012
88.130.20 [05] DIA KIT, LEVERS – 4 FN JOYSTICK, EH
88.130.20 [06] DIA KIT, 2 FN JOYSTICK – 3 FN JOYSTICK – EH
88.130.20 [07] DIA KIT, 2 FN JOYSTICK – 4 FN JOYSTICK – EH
88.130.20 [08] DIA KIT, 2 FN JOYSTICK – 2 FN LEVER – EH
88.130.20 [09] DIA KIT, JOYSTICK – 3 FN LEVER – EH
88.130.20 [18] KIT, ACCESSORIES, LINE ZBAR
88.130.20 [20] DIA KIT, 3 & 4 FN, EH HOSES
88.130.40 DIA KIT, RETRO CAB CONVERSION KIT
88.130.60 KIT, CAB, HINGE
90.100.AC HOOD PANELS; (Var) 402018063
90.100.BB ENGINE HOOD; (Var) 734890001

CNH