Caterpillarwheel tractor-scraperwheel scraper

Caterpillar 633E

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar 633E is a heavy-duty wheel tractor-scraper designed for high-capacity earthmoving. This series features the 3408E engine, providing net power ranging from 335 kW (450 hp) in lower gears to 365 kW (4-90 hp) in higher gears. The machine operates with a total empty weight of approximately 51,066 kg (112,580 lb) and utilizes a large scraper bowl with a heaped capacity of 26 m³ (34 yd³). It is part of the larger Caterpillar scraper lineage, following predecessors like the 633D and 633C.

The transition from the 633E to the Series II introduced advanced features such as the two-stage ejection system, where the floor slides back as the ejector moves forward. This generation remains significant in the used market due to high component commonality with other Caterpillar scrapers, which ensures parts availability. The integration of electronically controlled cushion hitches and improved wiring harnesses makes these machines durable assets for contractors managing large-scale site preparation.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.

Caterpillar 633E specifications

Engine

Model	3408E (also listed as 3408TA)
Net Power	490 hp (365.4 kW) for Gears 3-8; 450 hp (335.6 kW) for Gears 1-2
Gross Power	515 hp (384.1 kW) for Gears 3-8; 475 hp (354.3 kW) for Gears 1-2
Displacement	1099 in³ (18.1 L)
Bore	5.4 in (137.2 mm)
Stroke	6 in (152.4 mm)

Weights

Operating Weight (Empty)	112,678.3 lb (51,110 kg)
Total Shipping Weight	111,158 lb (50,420.5 kg)
Tractor Shipping Weight	46,200 lb (20,956 kg)
Scraper Shipping Weight	64,958 lb (29,464.5 kg)
Front Axle Weight (Loaded)	99,236 lb (45,012.7 kg)
Rear Axle Weight (Loaded)	95,344 lb (43,247.4 kg)

Dimensions

Overall Length	48.56 ft (14,800 mm)
Overall Width	13 ft (3,960 mm)
Overall Height	13.92 ft (4,240 mm)
Wheelbase	29.6 ft (9,020 mm)
Width - Inside of Bowl	134 in (3,403.6 mm)
Width - Outside Rear Tires	143.2 in (3,637.28 mm)
Height - Top of Cab	12.2 ft (3,715 mm)
Ground Clearance - Maximum	19.8 in (503 mm)

Performance

Max Forward Speed	33 mph (53 km/h)
Reverse Speed	6.2 mph (9.9 km/h)
Transmission Gears	8-speed power shift
Rated Payload	82,012 lb (37,200 kg)
Heaped Capacity	34.1 yd³ (26 m³)
Struck Capacity	23.2 yd³ (17.7 m³)
Maximum Depth of Cut	24.1 in (610 mm)
Steering Angle - Right	90 Degrees
Steering Angle - Left	85 Degrees

Service capacities (summary)

Fuel Tank	215 gal (813.9 L)
Hydraulic Reservoir	50 gal (189.3 L)
Transmission	33 gal (125 L)
Differential	36 gal (136.3 L)
Cooling System	33 gal (125 L)
Crankcase	11.7 gal (44.3 L)
Final Drive - Each	7 gal (26.5 L)

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

633E fluids & capacities

System	Capacity	Recommended fluid
Engine Crankcase	45 l (11.7 US gal)	Cat DEO or Cat DEO-ULS (for Tier 4 engines with aftertreatment); SAE 10W-30 is preferred for ambient temperatures between -18°C and 40°C
Cooling System	126 l (33 US gal)	Cat ELC (Extended Life Coolant)
Fuel Tank	814 l (215 US gal)	N/A
Transmission	127 l (33 US gal)	Cat TDTO (for transmissions, wet brakes, and final drives); SAE 10W, 30, or 50 depending on climate
Final Drives (each)	25 l (7 US gal)	Cat TDTO or Cat FDAO; SAE 60 for FDAO
Differential	136 l (36 US gal)	Cat TDTO or Cat GO (Gear Oil); SAE 80W-90 or 85W-140 for GO
Hydraulic Reservoir	190 l (50 US gal)	Cat HYDO Advanced 10 (cold to moderate temps) or Cat HYDO Advanced 30 (moderate to hot temps)
Wheel Coolant (each)	75 l (19.5 US gal)	N/A
Grease	N/A	Cat Multipurpose, Advanced 3Moly, Ultra 5Moly, Desert Gold, or Arctic Platinum depending on application and climate

Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.

Caterpillar 633E maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level and condition Inspect hydraulic fluid level via sight glass Verify coolant level and cap integrity Drain water from fuel water separator Monitor air filter restriction indicator Inspect all hydraulic hoses for cracks or leaks
Every 250 h	Change engine oil and filter Grease all pivot points including blade and hitch Perform visual inspection of chassis and frame Check air filter primary element condition Inspect belt and hose tension/wear
Every 500 h	Replace fuel filters Replace hydraulic return filter Perform battery service and terminal inspection Conduct detailed undercarriage or tire inspection Test coolant additive/SCA levels
Every 1,000 h	Perform hydraulic oil sample analysis (S.O.S) Service final drive oil Inspect turbocharger for play or leaks Check torque on ROPS bolts Measure component wear levels
Every 2,000 h	Change hydraulic system oil Perform full coolant flush and replacement Service transmission oil and filters Conduct comprehensive structural inspection Evaluate major component condition

Servicing the 633E beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize Caterpillar S.O.S Services to monitor engine oil, hydraulic fluid, and coolant. Analyze engine oil for wear metals like iron or copper and check for silicon indicating dirt ingestion. For the 633E's hydraulic system, track particle counts and viscosity changes to prevent pump failure. Regular coolant analysis is critical to detect sodium or glycol leaks before they cause liner pitting or head gasket damage.

Corrective & Common Repairs

Monitor the 3408E engine for air filter restriction and fuel system issues. Inspect hydraulic hoses on the bowl, floor, and ejector cylinders for abrasions that lead to leaks. Check the electronically controlled cushion hitch for nitrogen-over-oil accumulator performance. Address any transmission shifting irregularities by inspecting the eight-speed power shift components and ensuring directional shift management systems are functioning correctly.

Overhaul & Rebuild Points

Plan major interventions around the 2,000-hour mark, focusing on hydraulic oil changes and transmission services. Evaluate the condition of the two-stage ejection system's double-acting hydraulics. During structural inspections, check for fatigue in the hitch castings and frame welds. Inspect the turbocharger and engine valve train during top-end rebuilds to maintain the 3408E's rated horsepower and fuel efficiency.

Seasonal & Environment Servicing

In dusty or quarry environments, check air filters daily and clean radiator/oil cooler fins frequently. For high-temperature operations, monitor the laminated Thermo-Shield to ensure engine compartment temperatures remain safe. In cold climates, utilize the automatic ether starting aid and verify battery integrity. Ensure all centralized lubrication blocks for the hitch and steering are serviced to prevent premature wear in harsh conditions.

633E common service parts

Part number	Part	Notes
9S-8752	Nut-Full	Scheduled service item	Check fitment →

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633E fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
110-0	Engine Coolant Temperature — Above Normal	Low coolant level, thermostat failure	Inspect cooling system, refill coolant, test thermostat
110-3	Engine Coolant Temp Sensor — Voltage High	Open circuit or sensor failure	Check wiring; replace sensor if confirmed faulty
174-3	Engine Fuel Temperature — Voltage Above Normal	Open circuit in sensor wiring	Inspect harness and replace sensor if necessary
190-8	Engine Speed — Abnormal Frequency	Speed sensor air gap, sensor failure, or tone ring damage	Check sensor gap; test speed sensor and tone ring
41-3	8-Volt DC Supply — Voltage Above Normal	Short to power on 8V reference circuit	Inspect sensors sharing the 8V supply and isolate fault
41-4	8-Volt DC Supply — Voltage Below Normal	Short to ground on 8V reference circuit	Disconnect sensors one at a time to locate short
2348-9	SAE J1939 Data Link #2 — Abnormal Update Rate	CAN bus wiring damage or termination fault	Check CAN wiring and measure termination resistance
E360	Engine Coolant Temperature — High	Low coolant, failed thermostat, or water pump issue	Diagnose cooling system; do not operate until resolved

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

633E attachments & work tools

Scraper Bowl Configurations

Available in elevating flight and open bowl arrangements. The 633E Series II features an elevating scraper with a two-speed elevator drive for variable material loading.

Bowl Capacities

Heaped capacity is 34 yd³ (26 m³) and struck capacity is 23.2 yd³ (17.7 m³). The rated payload for the bowl is 82,000 lb (37,200 kg).

Mounting & Hitch Systems

Equipped with an electronically controlled cushion hitch design to dampen shocks. The system utilizes nitrogen-over-oil accumulators for road shock absorption and features a double kingbolt design for high external forces.

Hydraulic & Implement Arrangements

Features a two-stage ejection system where the floor slides back as the ejector moves forward. The machine utilizes smooth, double-acting hydraulics for ejector operation and includes an electronically controlled cushion hitch lock.

Ground Engaging Tools (G.E.T.)

Includes cutting edges, router bits, and floor plates. Cutting edge thickness is 1.4 in (35 mm) or 1.38 in (35 mm) depending on configuration/series.

Factory Guarding & Protection

Includes a scraper driveline guard to protect the output case, differential, and ejector cylinder. Laminated Thermo-Shield is used to reduce engine compartment surface temperatures.

All 633E assemblies by section

Every catalogued assembly group for the Caterpillar 633E. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Braking System

8w-3956 Actuator Gp-Brake

03***21	Bolt; (5/16-18x0.625-In)	20
1D***20	Nut,Plain,Hexagon Gear Mtg	1
2K***37	Nut (National Fine); (3/4-16-Thd)	2
3B***01	Pin,Cotter Bolt	1

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2t-3517 Control Gp-Service Brake

00***14	Coupling-Pipe	1
1L***79	Elbow-Pipe; (3/8 In Pipe)	1
1S***01	Union --Inversion Valve To Scraper Supply Hose; -- Inversion Valve To Scraper Supply Hose	1
2D***58	Union --Valve Assembly To Tractor Brake Delivery Hose	5

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9d-0400 Slack Adjuster Gp

1H***22	Plug-Expansion	1
3D***91	Steel Ball	1
5D***18	Button	2
5D***19	Cover	2

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9d-0390 Slack Adjuster Gp

1H***22	Plug-Expansion	1
3D***91	Steel Ball	1
5D***18	Button	2
5D***19	Cover	2

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Electrical And Starting System

1m-1882 Lamp Gp-Flood

1M***82	Lamp Group	1
1M***98	Lamp-Sealed Unit; (Flood)	1
2M***82	Ring-Mounting	1
2M***84	Molding Assembly	2

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7x-6219 Lamp Gp-Signal

2P***68	Moulding	1
6N***88	Body As-Lamp	1
6V***76	Screw; (Machine) (8-32x0.25 In)	1
7X***19	Lamp Group; (Stop/Tail)	1

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6n-7981 Lamp Gp -Signal-Stop/Tail-Stop, Tail

2P***68	Moulding	1
6N***81	Lamp Group	1
6N***82	Lamp-Sealed Unit	1
6N***83	Body As-Lamp	1

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9x-1439 Lamp Gp-Flood

8T***37	Screw; (Machine) (M4x0.7x12mm)	2
8T***21	Washer-Hard; (11x21x2.5-mm Thk)(M10x1.50x30mm)	1
8T***33	Nut (M10x1.50 Thd)	1
9X***39	Lamp Group-Flood; -Rear-Ladder Access-Engine Work Light	1

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5t-0763 Lighting Gp-Flood

01***02	Lockwasher	1
03***35	Bolt-Self Locking; 2.22cm(.875 In.) Lg	4
1M***82	Lamp Group	1
3D***54	Spacer; (47.8mm Thk)	1

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2t-3537 Lighting Gp-Flood

2B***52	Washer .047 In. (1.19 mm) Thick	1
2T***37	Lighting Group-Flood	1
7X***29	Washer; (11x25x3-mm Thk)	1
8T***33	Nut (M10x1.50 Thd)	1

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5t-6092 Lighting Gp-Roading

03***35	Bolt-Self Locking; 2.22cm(.875 In.) Lg	2
03***48	Clip; (11.11mm .437in Id)	4
03***57	Bolt; --To Reverse Shaft Bearing Retainer & Forward Shaft Bearing Retainer	8
1M***66	Plate	1

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5t-6093 Lighting Gp-Roading

2B***52	Washer .047 In. (1.19 mm) Thick	4
3H***81	Nut,Plain,Hexagon Terminal Assembly	2
4D***94	Clip-- Compressor Clutch Wire To Compressor Body	1
5M***62	Bolt; (3/8-16x0.75-In)	6

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2t-3538 Wiring Gp-Scraper

12***77	Harness As	1
12***78	Harness As	1
12***64	Harness As	1
12***49	Alarm Group	1

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Frame And Body

4t-8934 Fender Gp

1K***70	Nut (National Coarse)	8
1K***72	Locknut Horn To Guard	24
4T***83	Fender As	1
4T***84	Fender As; (Lh)	1

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2t-3922 Frame Gp-Draft

0L***78	Bolt,Machine Governor And Decelerator Control	4
10***46	Frame As	1
10***98	Arm As	1
10***99	Arm As	1

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2t-3536 Lines Gp-Central Lubrication

2D***83	Fitting	2
2T***36	Lines Group-Central Lubrication	1
3B***21	Bushing-Reducing; (.375in External Thread)	2
3B***85	Fitting-Hydraulic; Fitting 45 Degrees Angle--Used As Required	12

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Fuel System

8x-4259 Adapter Gp-Fast Fill Fuel

1S***33	Clip	3
21***03	Receiver; (Fast Fill Fuel)	1
27***95	Kit-Vent; (Fuel)(Plastic)	1
3B***00	Elbow	1

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2t-3533 Lines Gp-Fuel

2T***33	Lines Group-Fuel	1
3J***07	Seal Valve Assembly To; Seal- Tube Assembly To Logic Valve	1
3K***60	Seal Pilot Manifold On; Seal To Boom Check Valve Drain	2
5M***62	Bolt; (3/8-16x0.75-In)	11

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Hydraulic System

3g-9677 Cylinder Gp-Bowl

16***07	Seal As-Buffer	1
16***17	Seal-U-Cup	1
16***67	Seal-Wiper	1
1D***31	Bolt 4.25 In. (1.08 Dm) Long	2

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1u-0408 Cylinder Gp-Ejector

0S***56	Bolt 4 1/4 In. (108 mm) --Front Support Assembly To Frame	2
16***16	Seal As-Buffer	1
16***31	Seal-U-Cup	1
1D***08	Bolt-(3/4" X 2-3/4")-Rops Mounting Bracket To Fender	6

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2t-3616 Cylinder Gp-Floor

2T***16	Cylinder Group-Floor	1
4J***23	Wear Ring	1
5J***26	Ring-Wear	2
5J***00	Seal-U-Cup	1

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2t-3531 Lines Gp-Draft Frame

10***57	Tube As	1
1P***05	Seal (Check Valve Outlet)	4
1P***06	Seal; 57.9mm(2.28in.)I.D.	2
1P***07	Seal-Rectangular	6

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2t-3532 Lines Gp-Ejector

1F***48	Nut 12.70 mm(.50 In.) Thread	5
1P***79	Flange (Half)	8
1S***45	Plate .312 In. (7.9 mm) Thick	4
2T***16	Tube; (Short)	8

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2t-3540 Lines Gp-Motor

1P***03	Seal - Rectangular (31.86mm Id)	8
1P***04	Seal - Rectangular (45mm Dia)	12
1P***66	Split Flange Half, -16 (Cat)	16
1P***67	Flange-Half (43.31 mm Id)	4

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6e-5844 Motor Gp-Piston

11***44	Rotating Group-Motor	1
11***50	Housing	1
11***51	Valve Group-Relief	2
11***52	Head	1

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121-1280 Motor Gp-Piston

11***44	Rotating Group-Motor	1
11***50	Housing	1
11***76	Head	1
12***80	Motor Group-Piston	1

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111-7344 Rotating Gp-Motor

11***44	Rotating Group-Motor	1
11***46	Valve Group-Flushing; -Differential Steering Motor	1
11***84	Shaft-Drive	1
11***86	Piston	7

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4t-9860 Valve Gp-Check

12***53	Dowel	1
2S***96	Spring	1
3J***07	Seal Valve Assembly To; Seal- Tube Assembly To Logic Valve	1
4B***83	Ball 11.10 mm(.437 In.) Dia.	1

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2t-3894 Valve Gp-Check

2T***94	Valve Group-Check; -Ejector Lines	1
3E***71	Seal; (50.9mm Od)	1
4J***19	Seal-Interface Between 3rd & Tilt Valve	1
8C***79	Seal-O-Ring	1

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111-7346 Valve Gp-Flushing

11***46	Valve Group-Flushing; -Differential Steering Motor	1
11***88	Plate	1
11***89	Rod	1
11***27	Dowel	2

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114-9473 Valve Gp-Relief

11***73	Valve Group-Relief	1
11***77	Valve Group-Relief	1
3J***07	Seal Valve Assembly To; Seal- Tube Assembly To Logic Valve	2
3K***60	Seal Pilot Manifold On; Seal To Boom Check Valve Drain	2

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114-9474 Valve Gp-Relief

11***74	Valve Group-Relief	1
11***77	Valve Group-Relief	1
3J***07	Seal Valve Assembly To; Seal- Tube Assembly To Logic Valve	2
3K***60	Seal Pilot Manifold On; Seal To Boom Check Valve Drain	2

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115-1677 Valve Gp-Relief

11***77	Valve Group-Relief	1
11***18	Spring	1
12***89	Plug	1
2M***80	Seal--To Connector Pump Outlet	1

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Implements

2t-3514 Bowl Gp-Scraper

0L***78	Bolt,Machine Governor And Decelerator Control	2
0S***87	Bolt-Bracket Assembly To Timing Gear	2
0S***21	Bolt --Brace To Starting Engine Mounting Pad; Bolt-- Brace To Starting Engine Mounting Pad	4
0S***26	Bolt, Hex. Hd., 3/4in.-10 N.C. X 1 1/2in.	4

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2t-3526 Chain & Flight Gp

1P***25	Bolt-Track	168
2T***26	Chain & Flight Group	1
2T***62	Chain As	2
2T***33	Strip	14

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2t-3525 Drive Gp-Elevator

04***06	Pin-Spring	4
0S***95	Bolt 1.25 In. (31.75 mm) Long Guard Assemblies To Radiator Guard	4
11***73	Valve Group-Relief	1
11***74	Valve Group-Relief	1

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2t-3539 Ejector Gp

03***24	Bolt-Self Locking; 19mm(.75in.)Dia.	1
0S***87	Bolt-Bracket Assembly To Timing Gear	2
0S***27	Bolt -114.30 mm(4.50 In.) Long	4
14***91	Gasket	1

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2t-3530 Elevator Ar

2T***25	Drive Group-Elevator	1
2T***26	Chain & Flight Group	1
2T***27	Frame Group-Elevator	1
2T***28	Guard Group-Elevator	1

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2t-3521 Floor Gp

03***23	Bolt To Lower Rear Mainshaft Bearing Retainer	3
0L***40	Washer-Special; (.0478 In Thk)	8
0S***87	Bolt-Bracket Assembly To Timing Gear	4
0S***56	Bolt 4 1/4 In. (108 mm) --Front Support Assembly To Frame	2

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2t-3527 Frame Gp-Elevator

1K***78	Bolt; (1-1/4-7x13-In)	2
2T***27	Frame Group-Elevator	1
2T***78	Frame As	1
2T***50	Plate	2

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2t-3528 Guard Gp-Elevator

1A***58	Bolt 1.75 In. (44.45 mm) Long	4
2J***06	Nut Front Support To Frame; Nut-Front Support To Frame	4
2T***28	Guard Group-Elevator	1
2T***99	Guard As	1

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9j-1035 Roller Gp-Elevator Chain

0S***95	Bolt 1.25 In. (31.75 mm) Long Guard Assemblies To Radiator Guard	4
1S***47	Seal 17.17 mm. (.676 In.) I.D.	1
2H***90	Dowel .687 In. (17.46 mm) Long	1
2M***49	Washer-Retainer To Fan Bracket Assembly	4

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2t-3972 Idler Gp-Elevator Chain

1H***39	Packing,Preformed Cover Part Of Kit P/N 4j***80	1
1M***04	Support Assem.	1
1S***47	Seal 17.17 mm. (.676 In.) I.D.	1
2H***90	Dowel .687 In. (17.46 mm) Long	2

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2t-3973 Idler Gp-Elevator Chain

1H***39	Packing,Preformed Cover Part Of Kit P/N 4j***80	1
1M***04	Support Assem.	1
1S***47	Seal 17.17 mm. (.676 In.) I.D.	1
2H***90	Dowel .687 In. (17.46 mm) Long	2

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2t-3529 Linkage Gp-Elevator

1D***31	Bolt 4.25 In. (1.08 Dm) Long	4
1J***81	Cap-Bearing	2
2T***29	Linkage Group-Elevator	1
2T***67	Plate	2

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2t-3631 Reducer Gp-Elevator Speed -Lh

04***06	Pin-Spring	3
0A***63	Plug-Pipe	2
1A***22	Bolt-Generator To Flywheel Housing	5
1P***34	Cup-Roller Bearing (145.0mm Od)	2

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2t-3633 Reducer Gp-Elevator Speed -Rh

04***06	Pin-Spring	3
1A***22	Bolt-Generator To Flywheel Housing	5
1P***34	Cup-Roller Bearing (145.0mm Od)	2
2B***58	Plug--To Block Upper Front Air Manifold	2

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Machine Arrangement

2t-3535 Scraper Ar

1U***08	Cylinder Group-Ejector	1
2T***14	Bowl Group-Scraper	1
2T***17	Control Group-Service Brake	1
2T***21	Floor Group	1

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Power Train

5t-5914 Tire Gp

5T***14

Tire Group

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5t-5913 Tire Gp

5T***13

Tire Group

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5t-5912 Tire Gp

5T***12

Tire Group

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2t-3840 Wheel & Brake Ar

2G***11	Tire; (37.25-R35)	2
2T***16	Wheel Group-Rear	1
2T***40	Wheel & Brake Ar	1

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107-0587 Wheel & Brake Ar -Lh

10***87	Wheel & Brake Ar; -Lh	1
11***29	Wheel As	1
13***18	Guard-Grease	1
17***57	Drum As-Brake	1

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107-0588 Wheel & Brake Ar -Rh

10***88	Wheel & Brake Ar; -Rh	1
11***29	Wheel As	1
13***18	Guard-Grease	1
17***57	Drum As-Brake	1

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2t-3516 Wheel Gp-Rear

10***87	Wheel & Brake Ar; -Lh	1
10***88	Wheel & Brake Ar; -Rh	1
1D***27	Bolt,Machine Head Mtg Uoc:Bsv,Bsx	60
2T***16	Wheel Group-Rear	1

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Service Equipment And Supplies

2t-3899 Plate & Film Gp

10***03	Film-Stripe; (Lh-633e)	1
10***04	Film-Stripe; (633e)	1
13***55	Film Group	1
13***56	Film-Stripe; (Rh-Cat)	1

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Steering System

3g-7607 Cylinder Gp-Steering

16***07	Seal As-Buffer	1
16***17	Seal-U-Cup	1
16***67	Seal-Wiper	1
19***04	Kit-Seal; (Steering Cylinder)	1

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2t-3534 Lines Gp-Steering

0L***52	Capscrew (3/8 - 16 Nc X 3 1/4 Gd8, Hex)	16
1D***06	Bolt; (3/8-16x6-In)(Locations Y)	2
1P***77	Flange-Half (For Tilt Ports On Valve)	20
1S***45	Plate .312 In. (7.9 mm) Thick	9

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Work Tools

9j-5904 Edge Gp-Cutting -35-Mm Thk

2J***07	Nut-Full; (1-8 X38.1 Thd)	32
4F***42	Bolt 7.62 cm(3 In.) Long	22
4J***58	Bolt--Per Change 1 To 7j***85	10
7J***25	Cutting Edge 901.7 mm (35.50 In.) Long 34.9 mm (1.375 In.) Thick	2

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9j-1106 Edge Gp-Cutting

1D***35	Bolt (Mounted On Main Frame)	10
2J***07	Nut-Full; (1-8 X38.1 Thd)	32
4J***65	Bit (Routing)	2
4J***08	Bolt-Plow; (1-8x3.5-In)(1/8x3.5 In)	22

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2t-3696 Edge Gp-Cutting

1D***35	Bolt (Mounted On Main Frame)	10
2J***07	Nut-Full; (1-8 X38.1 Thd)	32
2T***96	Edge Group-Cutting	1
4J***65	Bit (Routing)	2

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4t-5493 Protector & Bit Gp

1U***05	Retainer-G.E.T.	2
2J***07	Nut-Full; (1-8 X38.1 Thd)	10
4F***42	Bolt 7.62 cm(3 In.) Long	10
4T***51	Support	2

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8j-4955 Tip Gp-Long

11***58	Pin; (G.E.T.)	1
11***59	Retainer Assembly; (G.E.T.)	1
1U***52	Tip (Long)	1
8J***55	Tip Group-Long; -J-350	1

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9j-1070 Tooth Gp-Scraper

2J***07	Nut-Full; (1-8 X38.1 Thd)	11
4J***08	Bolt-Plow; (1-8x3.5-In)(1/8x3.5 In)	11
8J***55	Tip Group-Long; -J-350	5
9J***70	Tooth Group-Scraper	1

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633E serial number reference

Locate the machine ID plate on the outer frame. The serial prefix is the first three alphanumeric characters of the Product Identification Number (PIN). For post-2001 models, the serial number is the last 8 characters of the 17-character PIN.

Prefix	Identifies	Notes
1EB	633E	Standard 633E configuration. Serial range starts at 1EB310. Used for electrical system documentation.
2PS	633E Series II	633E Series II configuration. Serial range starts at 2PS1. Covers repower and interactive electrical systems.
1FB	633E Series II	633E Series II configuration. Serial range starts at 1FB660. Part of the 631E/633E/637E Series II repower electrical system range.
1NB	633E Series II	633E Series II configuration. Serial range starts at 1NB1390. Part of the 631E/633E/637E Series II repower electrical system range.
1AB	633E Series II	633E Series II configuration. Serial range starts at 1AB1640. Part of the 631E/633E/637E Series II repower electrical system range.

Frequently asked questions

What engine is used in the Caterpillar 633E?

The Caterpillar 633E tractor is powered by the 3408E engine, featuring a displacement of approximately 18 L (1099 in³).

What is the total operating weight of the machine?

The total operating weight when loaded reaches approximately 88,260 kg (194,580 lb).

What model replaced the 633E series?

The 633E was part of a lineage that included the 633D and 633C; production of this specific type was withdrawn around 1996.

What 633E owners discuss

What are the primary engine performance characteristics of the 633E Series II tractor?

The 633E Series II utilizes a 3408E engine. Net power output varies by gear selection: gears 1-2 produce 450 hp (335 kW), while gears 3-8 produce 490 hp (365 kW). Gross power ratings are slightly higher, ranging from 475 hp (354 kW) in lower gears to 515 hp (384 kW) in higher gears.

How does the transmission and powertrain manage shifting and load?

The machine features an eight-speed power shift transmission. It utilizes Electronic Programmable Transmission Control (EPTC II) to record intermittent or current faults. Features like Controlled Throttle Shifting reduce drivetrain wear by decreasing fuel injection rates prior to gear changes, while Neutral Coast Inhibitor Control prevents shifting into neutral at speeds exceeding 8.1 km/h (5 mph).

What are the known hydraulic system specifications for the scraper and steering circuits?

The steering circuit provides a flow of 103 gpm (389 L/min) with a relief valve setting of 1960 psi (13500 kPa). The scraper circuit operates at 91 gpm (344 L/min). Additionally, a ground-driven secondary steering system is available, providing 52 gpm (200 L/min).

What maintenance or wear patterns should be monitored regarding the engine and cooling systems?

The 3408E engine uses oil-cooled pistons and full-length water-cooled cylinder liners to manage heat. The system includes an engine oil cooler and an aftercooler to reduce thermal stress on rings and liners. Operators should monitor for potential overheating symptoms such as steam, leakage, or sluggish performance, which can be caused by clogged strainers or fouled heat exchangers.

What electrical or sensor-related features are integrated into the 633E Series II?

The machine uses an Electronic Monitoring System that provides three-level warnings. The engine includes electronic controls for automatic altitude and air filter restriction derating. An engine overspeed indicator light and alarm will activate if RPM exceeds 2700. The EPTC II system is used for fault recording.

What should be checked when inspecting a used 633E Series II for purchase?

Verify the engine password status or obtain the code from the previous owner to ensure access. Inspect the condition of the electronically controlled cushion hitch and nitrogen-over-oil accumulators, as these are critical for shock absorption. Check the integrity of the scraper driveline guard, which protects the output case, differential, and ejector cylinder.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

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