Caterpillarwheel tractor-scrapertowed scraper

Caterpillar TS225

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar TS225 is a four-wheel towed wheel tractor-scraper, the largest model in Cat's TS-series towed scraper line. Unlike self-propelled Cat scrapers, it carries no onboard engine, ECM, transmission, or cooling system, operating instead as a trailed implement. It is pulled by a Cat track-type tractor, D8-class for single-tow or D10-class for tandem-tow configurations, or by a Challenger MT800/MT900-series wheel tractor rated 298-373 kW (400-500 hp) single-tow or 373-447 kW (500-600 hp) tandem-tow, with all bowl, apron, ejector, cutting-edge-angle, and brake hydraulics supplied from the towing tractor through hoses and quick-disconnect couplers at the hitch. Empty weight is 15,250 kg (33,620 lb) with a rated load of 25,580 kg (56,400 lb), heaped bowl capacity around 18.0 m3 (23.5 yd3), struck capacity 13.0 m3, riding on four 26.5R25 radial tires with dry-disc brakes. It runs on independent walking-beam suspension and is built as either a lead unit (serial prefix E1T) or a trailing unit (serial prefix E1W) for tandem-hitch operation.

Cat entered the towed-scraper business after its 2008 acquisition of E-Ject Systems of Elkader, Iowa, which formed the basis of the TS180, TS185, TS220, and TS225 line. Within that family, the TS225 is the largest four-wheel model, set apart from the two-wheel TS180/TS220 by its walking-beam suspension and by rear cylinders that allow cutting-edge-angle adjustment, a feature the two-wheel models lack. No successor model is documented as of this research, and the TS225 remains Cat's largest towed scraper. In the used and parts market, its value lies in flexibility: it hitches to widely available D8 or D10-class dozers or MT800/900-series wheel tractors rather than requiring a dedicated prime mover. Because it has no powertrain of its own, parts demand concentrates on wear items, cutting edges, hydraulic hoses and couplers, wheel bearings, hitch pins and bushings, and brake pads, rather than engine or transmission components.

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 TS225 specifications

Engine

Onboard engine	None. The TS225 is a towed scraper with no engine of its own; it is pulled and hydraulically powered by a separate tractor.
Recommended pulling unit, single scraper	Cat D8 track-type tractor, or a wheeled/ag tractor rated 298 to 373 kW (400 to 500 hp)
Recommended pulling unit, tandem scrapers	Cat D10 track-type tractor, or a wheeled/ag tractor rated 373 to 447 kW (500 to 600 hp)
Hydraulic remote services needed from tractor	3 for a single scraper hookup, 6 for a tandem hookup

Weights

Empty weight	15,250 kg (33,620 lb)
Rated load (heaped/struck bowl capacity basis)	25,580 kg (56,400 lb)
Weight distribution, empty	28% tongue / 72% axle
Weight distribution, loaded	29% tongue / 71% axle

Dimensions

Overall length, maximum	10,287 mm (405 in)
Bowl floor length	1,346 mm (53 in)
Bowl width, inside	3,632 mm (143 in)
Width across rear tires	3,912 mm (154 in)
Overall bowl width	3,988 mm (157 in)
Sidewall height	1,219 mm (48 in)
Height, floor to ejector top	1,930 mm (76 in)
Overall height, shipping position	2,515 mm (99 in)
Maximum ground clearance	660 mm (26 in)
Height, ground to cutting edge	811 mm (31.9 in)
Hitch pin diameter	89 mm (3.5 in)

Performance

Width of cut	3,785 mm (12.4 ft)
Maximum depth of cut	262 mm (10.3 in)
Maximum spread depth	737 mm (29 in)
Cutting edge thickness	22 mm (0.87 in)
Hitch articulation	±45° roll, ±90° yaw, ±27° pitch
Tires	4 x 26.5R25 radial
Brakes	Dry-disc hydraulic, 2 calipers per side (lead and trail)
Travel speed / gradeability	Not published separately for the TS225 — travel speed is governed by the towing tractor, not the scraper itself. Verify pulling-tractor gradeability with your dealer for the specific hookup.

Service capacities (summary)

Fuel tank, engine oil, cooling system	Not applicable. The TS225 carries no engine; these service points belong to the towing tractor, not the scraper.
Hydraulic system	No independent onboard hydraulic tank published; bowl, apron and ejector functions run off the towing tractor's hydraulic supply.
Front bowl cylinder	140 mm bore x 508 mm stroke (5.5 in x 20 in)
Rear bowl cylinder	152 mm bore x 203 mm stroke (6 in x 8 in)
Apron cylinder	102 mm bore x 965 mm stroke (4 in x 38 in)
Ejector cylinder	127 mm bore x 1,219 mm stroke (5 in x 48 in)

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

TS225 fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter)	Not applicable	TS225 has no onboard engine. It is a towed scraper pan pulled by a separate Cat track-type tractor or Challenger tractor; engine oil service applies to the towing unit, not the scraper pan itself.
Cooling system	Not applicable	No onboard engine or radiator on the scraper. Coolant service belongs to the towing tractor, not the TS225 pan.
Fuel tank	Not applicable	No onboard fuel system. The scraper carries no engine and no fuel tank of its own.
Transmission / powertrain compartment	Not applicable	No onboard drivetrain, torque converter, or powershift compartment. The scraper is ground-driven and towed; all propulsion and gearing belongs to the towing tractor.
Final drives / differentials	Not applicable	No final drive or differential assemblies on the scraper pan. The four wheels ride on independent walking-beam load-transferring axles with hub bearings only, not a powered drive axle.
Hydraulic system (bowl lift, apron, ejector, and cutting-edge-angle circuits) and tank	No onboard reservoir documented — this implement carries no hydraulic tank or pump of its own	Bowl, apron, ejector, and the TS225's adjustable cutting-edge-angle cylinders draw hydraulic power from the towing tractor through hose runs and quick-disconnect couplers rather than a scraper-mounted pump and tank. Fluid type and viscosity-by-climate grade follow whatever hydraulic oil (for example Cat HYDO Advanced or equivalent) the towing tractor's own operation and maintenance manual specifies; there is no separate TS225 hydraulic-fluid spec.
Wheel hubs / bearings (four-wheel walking-beam suspension)	Not published in available specification sheets for this model	Hub bearings are serviced on a scheduled interval; exact fill volume per hub is not listed in publicly available spec sheets. Sealed, oil-filled hubs on this scraper family are normally serviced with a Cat drivetrain-grade oil comparable to Cat TDTO (Tractor Hydraulic/Transmission/Drive Train Oil); confirm the exact grade against the TS225 OMM lubrication chart or with a Cat dealer before topping up.
Service brakes	Dry-disc brakes — not a fluid-filled system, no brake oil reservoir on the scraper	No brake fluid or oil capacity applies. Brake actuation is linked into the towing tractor's brake/hydraulic circuit per the coupling configuration used.
Grease points (hitch/drawbar, walking-beam axle pivots, bowl and apron linkage, ejector guide, cutting-edge-angle cylinder pivots)	Grease-fitting service — no reservoir volume specified; interval per the lubrication chart	Serviced with Cat's standard multipurpose extreme-pressure grease line. Cat Advanced 3Moly Grease covers moderate speed, load, and temperature service from -20 to 40 C (-4 to 104 F); Cat Ultra 5 Moly Grease is the step-up choice for heavier load or higher-temperature duty points. Confirm the exact grade called out against the TS225 OMM lubrication chart, since public spec sheets do not publish a model-specific grease grade.

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

Caterpillar TS225 maintenance schedule

Service interval	Tasks
Every 10 h	Grease hitch platform pins, bushings, and stop blocks per the lubrication chart Grease walking-beam pivot pins and bushings Check wheel-hub oil level at the sight glass on each hub Inspect dry-disc brake calipers and pads for wear, leaks, or uneven contact Inspect hydraulic hoses and quick-disconnect couplers at the hitch tower for chafing or leaks Check cutting-edge wear and tire condition and inflation
Every 250 h	Grease all bowl, apron, and ejector cylinder pivot points per the lubrication chart Inspect cylinder rod seals for leakage, scoring, or pitting Check tandem lead and trailing quick-disconnect fittings for wear or damage Torque-check wheel rim and hub fasteners Inspect steel brake and hydraulic lines routed through the bowl walls on trailing units
Every 500 h	Change wheel-hub oil on all four hubs Inspect walking-beam pivot pins and bushings, measure clearance against wear limits Rotate or replace cutting edges on the 180-degree schedule Inspect brake caliper mounting and pad thickness, replace pads as needed Check hitch pin and bushing wear, measure hitch tower play
Every 1,000 h	Inspect and replace hydraulic hoses showing wear or chafing at the hitch tower Disassemble and inspect wheel-hub seals, replace if leaking Inspect apron and ejector cylinder mounting pins and bushings, replace as needed Check hitch articulation stops and pins (±45° roll, ±90° yaw, ±27° pitch) for wear Inspect frame and bowl-wall welds near cylinder mounts for cracking
Every 2,000 h	Overhaul or exchange bowl, apron, and ejector cylinders (reseal rods, inspect barrels) Replace walking-beam pivot pins and bushings Replace wheel-hub bearings and seals Inspect and replace internal steel brake and hydraulic lines in trailing-unit bowl walls as needed Replace hitch pin and bushing set
Every 4,000 h	Full disassembly of the walking-beam suspension for bushing and bearing replacement Replace dry-disc brake caliper assemblies Recondition or replace cutting edges and end bits at wear limit Inspect hitch tower, frame, and bowl structure for fatigue cracking and repair per dealer inspection

Servicing the TS225 beyond the schedule

Predictive Maintenance & Fluid Analysis

Since the scraper carries no engine or transmission, predictive care focuses on wheel-hub oil sampling and walking-beam and hitch wear tracking rather than engine oil analysis. Sample wheel-hub oil at scheduled intervals to catch bearing wear or seal contamination early. Monitor hydraulic fluid supplied from the towing tractor for contamination at the hitch coupler interface, since cylinder scoring and slow bowl, apron, or ejector response often trace back there. Track hitch pin and walking-beam bushing clearance trends to schedule replacement before excess play develops.

Corrective & Common Repairs

Most corrective work centers on hitch and suspension wear: replacing worn hitch pins, bushings, and stop blocks, rebuilding walking-beam pivots showing excess clearance, and resealing bowl, apron, or ejector cylinder rods after leakage. Chafed or cracked hydraulic hoses at the hitch tower are a recurring failure point given constant articulation (±45° roll, ±90° yaw, ±27° pitch); reroute and replace before they burst mid-cycle. Dry-disc brake pads and calipers, actuated hydraulically from the towing tractor, wear unevenly on tandem units and need periodic caliper service.

Overhaul & Rebuild Points

Major overhaul targets the walking-beam suspension (pivot pins, bushings, bearings), wheel hubs (bearings, seals, oil change), and bowl, apron, and ejector cylinders (full reseal or exchange) at extended hour milestones. Tandem trailing units, serial prefix E1W, also need inspection of the internal steel brake and hydraulic lines routed through the bowl walls, since these are harder to access and prone to fatigue at flex points. Hitch tower and frame structure should be checked for cracking near cylinder mounts and articulation stops during any rebuild.

Seasonal & Environment Servicing

In abrasive or wet operating conditions, check cutting edges more frequently for wear and rotate them 180 degrees before they thin unevenly, which doubles service life. Cold-weather startup should include verifying wheel-hub oil hasn't gelled and inspecting hydraulic hoses at the hitch for stiffness or cracking before the first duty cycle. In muddy or high-moisture sites, flush and repack walking-beam and hitch grease points more often, and check tire condition and inflation, since load transfer through the walking beams increases uneven tire wear.

TS225 attachments & work tools

Cutting edge / bowl configuration

The center cutting edge sits in the stinger (drop-down) position for good penetration and efficient material flow into the bowl. Edges can be rotated 180 degrees when worn, doubling service life. An additional pair of rear lift cylinders on the four-wheel TS225 lets the operator adjust cutting-edge angle to suit different soil conditions.

Ejector

A single plate of high-strength, abrasion-resistant steel forms the ejector, extending beyond the front edge of the scraper floor to minimize carryback. Ejector weight rides on steel rollers over a wear strip welded to the bowl floor, with UHMW plastic guides maintaining side alignment.

Hitch / tractor coupling

A bolt-on hitch design reduces wear on the hitch pin. The hitch platform lets the tongue move in six directions, with stop blocks preventing the tongue from contacting the pulling tractor's tires or tracks. The TS225 is set up to be towed by Cat track-type tractors or Challenger MT800/MT900 series wheel tractors.

Tandem lead/trailing arrangement

The TS225 can run as a standalone unit or in a tandem push-pull pair, configured as either the lead or trailing scraper. The lead unit has a countersunk hitch that allows push-loading when working alone; in tandem, the trailing unit's brake and hydraulic lines run as steel lines inside the bowl walls to avoid hose damage from bowl material or top-loading.

Suspension and brakes

Four-wheel walking-beam suspension gives a smoother ride, reduced side sway, and easier grading control. Dry-disc brakes are standard equipment across the Cat towed-scraper line, including the TS225.

Hydraulic accessory kit

A hydraulic hose hanging tower kit is available for Challenger MTS800/MTS900 series pulling tractors, keeping hoses vertically aligned and free of entanglement to reduce hose, fitting, and valve wear.

All TS225 assemblies by section

Every catalogued assembly group for the Caterpillar TS225. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Braking System

331-2681 Brake Gp-Hyd Caliper Service

15***36	Brake Group-Service	4
33***81	Brake Group-Hydraulic Caliper Service	1
3J***07	Seal Valve Assembly To; Seal- Tube Assembly To Logic Valve	4
6G***32	Adapter	4

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157-8236 Brake Gp-Service

14***46	Kit-Seal	1
14***48	Cover	1
14***58	Seal	3
15***36	Brake Group-Service	1

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334-2731 Lines Gp-Brake -Trailing

10***06	Hose As	1
13***33	Hose As	2
13***16	Hose As	1
14***67	Elbow Group; (Each Includes)	5

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331-2659 Lines Gp-Brake -Lead

10***06	Hose As	1
13***33	Hose As	2
14***36	Adapter; (Straight) (-6 Orb X -6 Orfs)	2
14***67	Elbow Group; (Each Includes)	4

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Frame And Body

331-2627 Axle Gp-Oscillating

33***27	Axle Group-Oscillating	1
33***28	Housing As-Oscillating Axle; -Rh	1
33***29	Housing As-Oscillating Axle; -Lh	1
34***55	Lock As-Transport	2

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331-2695 Block Gp-Push -Lead

32***65	Block As-Push	1
32***09	Clamp	1
32***16	Support Group-Lines	1
32***72	Cap	4

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331-2706 Block Gp-Push -Trailing

32***90	Block As-Push	1
32***72	Cap	4
33***96	Pin	2
33***06	Block Group-Push; -Trailing	1

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320-4697 Hitch Gp

10***64	Bearing	3
1A***63	Bolt, Hex, Hd., 3/4"-10 N.C. X 2 1/2"	6
2J***37	Pin	1
2J***46	Ring	3

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330-8539 Hitch Gp-Towing -Lead

03***82	Bolt-12 Point Head; (5/8-11x2.5-In)	8
18***00	Canister-Storage	1
32***30	Tongue As	1
32***61	Block	1

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331-2717 Hitch Gp-Towing -Trailing

03***82	Bolt-12 Point Head; (5/8-11x2.5-In)	8
18***00	Canister-Storage	1
32***61	Block	1
32***63	Tongue As	1

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341-3271 Hitch Gp-Towing

32***32	Drawbar As	1
32***58	Plate As	1
32***92	Pin	1
33***33	Clamp	1

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331-2628 Housing As-Oscillating Axle -Rh

09***45	Seal	2
33***40	Shaft-Axle	1
33***42	Cover	1
33***28	Housing As-Oscillating Axle; -Rh	1

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331-2629 Housing As-Oscillating Axle -Lh

09***45	Seal	2
33***40	Shaft-Axle	1
33***42	Cover	1
33***29	Housing As-Oscillating Axle; -Lh	1

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331-2658 Lines Gp-Lubrication -Lead

16***97	Connector As	4
33***58	Lines Group-Lubrication; -Lead	1
33***47	Hose As	2
6V***97	Seal (Later Machines And Field Installed)	1

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345-0461 Support Gp-Lines

34***77	Mount As	1
34***87	Washer-Thrust	1
34***61	Support Group-Lines	1
34***62	Arm As; (Hitch)	1

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Hydraulic System

320-4522 Control Ar-Hydraulic -Trailing

32***22	Control Ar-Hydraulic; -Trailing	1
33***51	Cylinder Group-Ejector	1
33***55	Cylinder Group-Bowl	1
33***56	Cylinder Group-Apron	1

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320-4516 Control Ar-Scraper Hydraulic -Lead

32***16	Control Ar-Scraper Hydraulic; -Lead	1
33***51	Cylinder Group-Ejector	1
33***52	Lines Group-Ejector; -Lead	1
33***53	Lines Group-Apron; -Lead	1

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331-2656 Cylinder Gp-Apron

2H***06	Setscrew-Socket; (1/2-13x1-In)	2
32***27	Plate	6
32***95	Pin	2
32***96	Pin	2

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331-2657 Cylinder Gp-Bowl

32***27	Plate	8
33***57	Cylinder Group-Bowl	1
33***33	Washer; (60.33x101.6x6.35-mm Thk)	4
33***34	Pin	2

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331-2655 Cylinder Gp-Bowl

32***27	Plate	4
32***98	Pin	4
33***38	Washer; (60.33x101.6x4.76-mm Thk)	8
33***55	Cylinder Group-Bowl	1

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331-2651 Cylinder Gp-Ejector

2D***48	Ring-Retaining	2
33***98	Pin	1
33***51	Cylinder Group-Ejector	1
33***35	Pin	1

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338-5015 Fitting Gp-Quick Disconnect -Lead

2M***80	Seal--To Connector Pump Outlet	1
33***45	Connector	1
33***92	Coupler-Quick	6
33***97	Coupler-Quick	6

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338-5013 Fitting Gp-Quick Disconnect -Lead

14***27	Connector Group	12
15***71	Cap-Dust	12
33***44	Coupler	12
33***98	Coupler-Quick	1

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338-5021 Fitting Gp-Quick Disconnect -Lead

15***28	Plug-Dust	6
23***83	Connector	1
23***84	Connector As	6
33***93	Coupler-Quick	6

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338-5208 Fitting Gp-Quick Disconnect -Lead

14***27	Connector Group	12
33***95	Connector-Quick	12
33***98	Coupler-Quick	1
33***00	Cap-Dust	12

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338-5682 Fitting Gp-Quick Disconnect -Trailing

33***97	Connector-Quick	6
33***98	Cap-Dust	6
33***82	Fitting Group-Quick Disconnect; -Trailing	1

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338-5014 Fitting Gp-Quick Disconnect -Trailing

14***27	Connector Group	6
15***71	Cap-Dust	6
33***44	Coupler	6
33***98	Coupler-Quick	1

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338-5681 Fitting Gp-Quick Disconnect -Lead

33***97	Connector-Quick	12
33***98	Cap-Dust	12
33***81	Fitting Group-Quick Disconnect; -Lead	1

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338-5209 Fitting Gp-Quick Disconnect -Trailing

14***27	Connector Group	6
33***95	Connector-Quick	6
33***98	Coupler-Quick	1
33***00	Cap-Dust	6

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338-5019 Fitting Gp-Quick Disconnect -Lead

14***27	Connector Group	12
15***27	Cap-Dust	12
15***90	Fitting As	12
33***98	Coupler-Quick	1

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338-5210 Fitting Gp-Quick Disconnect -Lead

23***83	Connector	1
23***84	Connector As	6
33***96	Coupler-Quick	1
33***98	Cap-Dust	6

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338-5020 Fitting Gp-Quick Disconnect -Trailing

14***27	Connector Group	6
15***27	Cap-Dust	6
15***90	Fitting As	6
33***98	Coupler-Quick	1

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331-2653 Lines Gp-Apron -Lead

14***15	Connector As	4
14***60	Elbow Group	4
14***76	Elbow As	2
14***78	Elbow, 90°,-6 Orb /-6 Orfs; (90°) (-6 Orbx-6orfs)	2

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334-2691 Lines Gp-Apron -Trailing

14***15	Connector As	4
14***60	Elbow Group	4
14***76	Elbow As	2
14***78	Elbow, 90°,-6 Orb /-6 Orfs; (90°) (-6 Orbx-6orfs)	2

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334-2684 Lines Gp-Bowl Cylinder -Lead

11***53	Hose As	2
14***27	Connector Group	4
14***47	Elbow; (-12 Orb/Orfs)	4
14***76	Elbow As	2

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334-2688 Lines Gp-Bowl Cylinder -Lead

14***15	Connector As	4
14***22	Adapter; (-10orb/-12orfs)	2
15***37	Elbow As	2
15***48	Elbow As	2

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334-2693 Lines Gp-Bowl Cylinder -Trailing

14***27	Connector Group	4
14***47	Elbow; (-12 Orb/Orfs)	4
14***76	Elbow As	2
14***55	Union As	4

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331-2652 Lines Gp-Ejector -Lead

14***27	Connector Group	3
14***47	Elbow; (-12 Orb/Orfs)	2
14***60	Elbow Group	2
14***55	Union As	2

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334-2690 Lines Gp-Ejector -Trailing

14***27	Connector Group	2
14***47	Elbow; (-12 Orb/Orfs)	2
14***60	Elbow Group	2
14***55	Union As	2

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331-2654 Lines Gp-Hydraulic -Lead

33***54	Lines Group-Hydraulic; -Lead	1
34***58	Plate	1
34***63	Clevis	2
34***65	Spring	1

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334-2692 Lines Gp-Hydraulic -Trailing

33***92	Lines Group-Hydraulic; -Trailing	1
34***58	Plate	1
34***63	Clevis	2
34***65	Spring	1

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334-2685 Lines Gp-Rear Attachment -Lead

10***10	Hose Assem.	1
14***47	Elbow; (-12 Orb/Orfs)	4
14***55	Union As	24
14***52	Union As	1

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335-8436 Manifold Gp-Hydraulic -Lh, Lead

16***19	Plug As	1
2M***80	Seal--To Connector Pump Outlet	1
33***36	Manifold Group-Hydraulic; -Lh, Lead	1
33***37	Manifold As-Hydraulic	1

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337-8011 Manifold Gp-Hydraulic -Lh, Trailing

16***19	Plug As	1
2M***80	Seal--To Connector Pump Outlet	1
33***10	Manifold As-Hydraulic	1
33***11	Manifold Group-Hydraulic; -Lh, Trailing	1

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337-8012 Manifold Gp-Hydraulic -Rh, Trailing

14***09	Plug As-Sto	2
16***19	Plug As	1
2M***80	Seal--To Connector Pump Outlet	1
33***10	Manifold As-Hydraulic	1

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335-8443 Manifold Gp-Hydraulic -Rh, Lead

16***19	Plug As	1
2M***80	Seal--To Connector Pump Outlet	1
33***43	Manifold Group-Hydraulic; -Rh, Lead	1
33***44	Manifold As-Hydraulic	1

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Implements

331-2647 Apron Gp

32***14	Apron As	1
33***47	Apron Group	1
34***59	Trunnion	2
5P***66	Capscrew; (Hex Hd) (1/2-13 Nc X 1 1/2) (Gd 8 Z)	16

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320-4569 Bowl Gp-Scraper -Lead

32***84	Bowl As	1
32***93	Plate	2
32***95	Plate	1
32***25	Guard-Hood	1

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331-2702 Bowl Gp-Scraper -Trailing

32***93	Plate	2
32***95	Plate	1
32***25	Guard-Hood	1
32***26	Plate	2

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331-2648 Ejector Gp

32***96	Ejector As	1
33***48	Ejector Group	1
33***42	Block	1
33***43	Block	1

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331-2707 Link Gp-Stabilizer -Trailing

32***30	Frame As-Lift	1
32***72	Cap	2
33***97	Pin	1
33***07	Link Group-Stabilizer; -Trailing	1

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331-2708 Link Gp-Stabilizer -Lead

32***09	Frame As-Lift	1
32***72	Cap	2
33***97	Pin	1
33***08	Link Group-Stabilizer; -Lead	1

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334-2732 Roller & Mtg Gp-Ejctr Carrier

32***94	Roller Group-Ejector Carrier	2
33***32	Roller & Mtg Group-Ejctr Carrier	1
6V***82	Nut-Full (3/4-10 Thd)	2
8T***11	Bolt-Plt; (3/4unc X 4 1/2)	2

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320-4394 Roller Gp-Ejector Carrier

19***12	Seal-O-Ring	1
22***76	Housing-Bearing	1
22***78	Wheel	1
22***79	Cap	1

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Machine Arrangement

320-3874 General Ar-Scraper -Trailing

32***74	General Ar-Scraper; -Trailing	1
32***82	Scraper Ar; -Trailing	1
32***15	Wheel & Brake Ar; -Lead	1
32***22	Control Ar-Hydraulic; -Trailing	1

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320-3873 General Ar-Scraper -Lead

32***73	General Ar-Scraper; -Lead	1
32***81	Scraper Ar; -Lead	1
32***15	Wheel & Brake Ar; -Lead	1
32***16	Control Ar-Scraper Hydraulic; -Lead	1

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320-3882 Scraper Ar -Trailing

32***82	Scraper Ar; -Trailing	1
33***27	Axle Group-Oscillating	1
33***82	Support Group-Axle	1
33***02	Bowl Group-Scraper; -Trailing	1

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320-3881 Scraper Ar -Lead

32***81	Scraper Ar; -Lead	1
32***69	Bowl Group-Scraper; -Lead	1
33***39	Hitch Group-Towing; -Lead	1
33***27	Axle Group-Oscillating	1

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Power Train

340-6275 Rim Gp-Demountable

2D***43	Seal-O-Ring	1
2D***11	Valve Group-Tire	1
32***90	Rim Group-Demountable	1
34***75	Rim Group-Demountable	1

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328-7590 Rim Gp-Demountable

32***89	Rim As	1
32***90	Rim Group-Demountable	1
4F***25	Flange	2
7D***69	Ring-Lock	1

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331-2682 Support Gp-Axle

32***32	Axle As-Rear	1
33***72	Clamp	4
33***82	Support Group-Axle	1
33***18	Bolt; (7/8-9x3.5-In)	8

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340-6276 Tire & Rim Ar

12***83	Tire; (26.5-R25)	4
34***75	Rim Group-Demountable	4
34***76	Tire & Rim Ar	1
34***14	Mounting Group-Rim	4

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320-4515 Wheel & Brake Ar -Lead

32***15	Wheel & Brake Ar; -Lead	1
33***49	Wheel Group; -Rh	2
33***50	Wheel Group; -Lh	2
33***81	Brake Group-Hydraulic Caliper Service	1

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331-2649 Wheel Gp -Rh

14***09	Plug As-Sto	1
18***75	Bolt-Socket Head; (3/4-10 Thd)	16
26***77	Stud-Wheel	24
2M***44	Ring (Part Of 8p***48 Group)	2

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331-2650 Wheel Gp -Lh

14***09	Plug As-Sto	1
18***75	Bolt-Socket Head; (3/4-10 Thd)	16
26***77	Stud-Wheel	24
2M***44	Ring (Part Of 8p***48 Group)	2

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Service Equipment And Supplies

335-1808 Film Gp

33***92	Film-Identification; (Caterpillar)	1
33***94	Film-Identification; (Cat)	1
33***98	Film-Identification; (Cat Ts225, Lh)	1
33***02	Film-Identification; (Cat Ts225, Rh)	1

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331-5259 Plate & Film Gp -Trailing

19***86	Film; (Safety) (To Right And Left Of Fuel Tank)	2
19***74	Film-Stripe; (Yellow, Reflective)(Fender)	6
22***05	Film; (Warning) (Universal) (On Lh Post Inside Cab)	1
25***56	Film-Instruction; (Lift Eye Location)	4

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320-3867 Plate & Film Gp -Trailing

19***86	Film; (Safety) (To Right And Left Of Fuel Tank)	2
19***74	Film-Stripe; (Yellow, Reflective)(Fender)	6
22***54	Film-Warning; (Universal, Read Omm, Intl)	1
25***56	Film-Instruction; (Lift Eye Location)	4

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320-3866 Plate & Film Gp -Lead

19***86	Film; (Safety) (To Right And Left Of Fuel Tank)	2
19***74	Film-Stripe; (Yellow, Reflective)(Fender)	6
22***54	Film-Warning; (Universal, Read Omm, Intl)	1
25***56	Film-Instruction; (Lift Eye Location)	4

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331-5258 Plate & Film Gp -Lead

19***86	Film; (Safety) (To Right And Left Of Fuel Tank)	2
19***74	Film-Stripe; (Yellow, Reflective)(Fender)	6
22***05	Film; (Warning) (Universal) (On Lh Post Inside Cab)	1
25***56	Film-Instruction; (Lift Eye Location)	4

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Work Tools

330-8537 Edge Gp-Bit & Cutting

1J***07	Bolt 6.99cm (2.75 In.) Long	15
2J***06	Nut Front Support To Frame; Nut-Front Support To Frame	14
2J***07	Nut-Full; (1-8 X38.1 Thd)	15
33***37	Edge Group-Bit & Cutting	1

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TS225 serial number reference

The PIN plate on the TS225 is a riveted metal tag on the main frame near the front drawbar/hitch area, since the scraper itself carries no engine or cab. Read the first three characters as the prefix (letter-digit-letter), which identifies the model and lead/trailing configuration, followed by a sequential machine number; the plate does not encode a build year directly.

Prefix	Identifies	Notes
E1T	Lead unit (single-scraper or forward unit in tandem-tow configuration)	E1T00001-UP. Passive towed scraper, no engine/ECM. Four-wheel pan, walking-beam suspension, 18 m3 / 23.5 yd3 heaped capacity, pulled by a Cat track-type or Challenger tractor. Parts-catalog machine-arrangement listings tie E1T specifically to the LEAD configuration of the TS225. Confirm with your dealer for an exact serial-range match.
E1W	Trailing unit (rear scraper when two TS225 units are towed in tandem)	E1W00001-UP. Same base machine as the E1T lead unit but fitted with trailing-unit hitch/control-group hardware instead of the lead hitch. Parts-catalog machine-arrangement listings tie E1W specifically to the TRAILING configuration of the TS225. Confirm with your dealer for an exact serial-range match.

Frequently asked questions

What engine powers the Caterpillar TS225?

None. The TS225 is a passive towed scraper with no onboard engine, ECM, or transmission. Its bowl, apron, ejector, cutting-edge-angle, and brake functions run on hydraulics supplied from the towing tractor, either a Cat D8-class (single-tow) or D10-class (tandem-tow) track-type tractor, or a Challenger MT800/MT900-series wheel tractor rated 298-373 kW (400-500 hp) single-tow or 373-447 kW (500-600 hp) tandem-tow.

What is the operating weight of the TS225?

Empty weight is 15,250 kg (33,620 lb). Rated load is 25,580 kg (56,400 lb), for a loaded weight around 40,830 kg (90,020 lb). Heaped bowl capacity is about 18.0 m3 (23.5 yd3), struck capacity 13.0 m3.

What replaced the Caterpillar TS225?

No successor model is documented as of this research. The TS225 remains the largest model in Cat's TS-series towed scraper line (TS180, TS185, TS220, TS225), introduced after Cat's 2008 acquisition of E-Ject Systems.

What TS225 owners discuss

What wears first on the TS225 tow hitch, and how do owners keep it tight?

The hitch pin itself rarely wears loose because it is an oversized pin held by multiple bolts rather than a floating pin in a bore. What owners actually chase is play in the hitch platform bushings that let the tongue oscillate side to side, twist, and pitch up and down as the tractor works uneven ground. Left unchecked, that bushing wear shows up as a clunk on direction changes and accelerated wear at the tongue stop blocks. Grease the hitch platform on the schedule in the maintenance manual, not just when it squeaks, and check for movement in the platform pins with the scraper unhooked and jacked. Any detectable play in the pin-to-bushing fit at the hitch platform is worth pulling and measuring rather than living with, since this joint carries the full pull load plus roll and yaw. Have your dealer verify pin and bushing clearances against spec before returning the machine to service.

Is the walking-beam suspension and wheel hub setup something to worry about long term?

Not really, and that is the point of the design. The four-wheel arrangement rides on independent walking beams that transfer load between the front and rear wheel on each side, which is what gives the smoother ride and less side sway compared with a rigid axle. The wheel hubs are oil-filled rather than grease-packed, so the main long-term care item is checking hub oil level and condition at the interval in the manual and watching for weeping seals rather than periodic hand-packing. Where owners do see wear is at the walking-beam pivot pins and bushings on machines that see a lot of rough, undulating haul roads - that pivot takes constant articulation and is worth a visual and play check at the same time as hitch service. Excessive beam pivot movement should be measured and compared to allowable clearance rather than guessed at.

How long do the dry disc brakes last and what causes premature wear?

The dry-disc brake package on this scraper is the same basic hydraulically actuated caliper design used on Cat's own articulated trucks, so it is built for repeated, heavy-duty stops rather than light-duty use, and in normal towed-scraper service the discs and pads hold up well. Premature wear traces almost always back to two things: riding the brakes down long grades instead of using them as intended for control, and hydraulic supply issues from the towing tractor causing partial or dragging application. Because the brake circuit is supplied and actuated from the tractor, not from anything onboard the scraper, any brake performance complaint should start with checking tractor-side hydraulic pressure and the connection at the hitch before condemning the caliper or disc. Brake wear and function are safety-critical - have your dealer verify caliper travel, disc thickness, and system pressure rather than judging by pedal feel alone.

The bowl, apron, or ejector cylinders feel slow or leak down - where's the actual problem likely to be?

Since this scraper has no onboard pump or reservoir, every cylinder on it - bowl lift, apron, and ejector - runs off hydraulic supply routed from the towing tractor through the hitch connections and hoses along the tongue. A cylinder that drifts down, feels slow, or won't hold position is just as likely to be a worn quick-disconnect coupler, a pinched or chafed hose at the hitch tower, or a tractor-side valve or pump issue as it is to be an internal cylinder seal failure. Work the fault back toward the tractor first: check coupler condition, hose routing for rubbing against the tongue or bowl structure, and confirm the tractor is delivering full flow and pressure to the circuit before pulling a cylinder. On tandem setups the rear scraper's lines run inside the bowl walls specifically to avoid hose damage from material or top-loading, so damage there points to a install or routing error rather than normal wear.

Do the cutting edges really flip and reuse, or is that just a sales pitch?

It is a real, practical feature and worth using. The cutting edge is designed to be unbolted, rotated 180 degrees, and reinstalled once the working face wears down, effectively doubling edge life before a new edge is needed. The catch is timing - flip it before the edge wears into the mounting holes or thins enough to affect the bowl-to-ground relationship, not after. On the four-wheel model the rear cylinders also let you adjust cutting-edge angle for the material being cut, so a lot of what looks like uneven edge wear is actually an angle setting issue rather than a defective edge. Check edge thickness and angle setting together before ordering a replacement.

What should a buyer walk away from when looking at a used TS225?

Start at the bowl: floor, side plates, apron, and ejector should be checked for wear-through, cracking, and bent structure, since the abrasion-resistant steel is there to be sacrificial and does eventually thin out. Pull on the bowl and apron pins for play, and look at the ejector rollers and track for scoring. At the hitch, check the platform pins and bushings for play under load, not just visually, and inspect the tongue and stop blocks for impact damage from being overstressed on rough ground. Check hydraulic hose and coupler condition all the way from the hitch to the cylinders, since these machines are only as good as the connection to whatever tractor pulls them, and a scraper that has been mismatched to an undersized tractor will show it in stressed hitch hardware. Check disc brake condition and confirm even application side to side. Check tire tread and sidewall condition given the load these carry, and check cutting edge thickness and whether it has already been flipped once. Get any hitch, brake, or hydraulic finding verified by a dealer before committing to a price, since these are the items that are expensive to ignore and cheap to catch early.

How should a tandem lead-and-trailing pair be hooked up, and what goes wrong if it's done wrong?

In tandem work one scraper runs as the lead unit with a countersunk hitch that can also take push loading if it ever runs solo, and the second runs as the trailing unit behind it. The rear scraper's brake and hydraulic lines are meant to run as steel lines inside the bowl walls rather than exposed hose, specifically so bowl material and top-loading don't tear up the lines - if a trailing unit has been fitted with exposed hose in that run, expect chafing and leaks. The lead/trailing quick-disconnect fittings are matched pairs and are not interchangeable with single-unit fittings, so mixing them up is a common source of connection leaks or lines that won't seal under pressure. If a cushion-hitch option is fitted for transport, confirm the accumulators charge and discharge properly before towing at speed, since that circuit is doing double duty as a ride-control system. Have your dealer verify correct fitting pairing and line routing on any tandem setup before it goes to work, since a misrouted or mismatched connection under pressure is a safety issue, not just a convenience one.

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

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