Ford 6610 service schedule
Ford 10 series · 1981–1989 (UK; TractorData gives 1982–1993 for North America)
Every maker's service job for the Ford 6610, counted in hours, with the oils, filters and parts each one needs. Add your tractor to Farmyard Workshop and it works out what's due from your hours and dates, and keeps the service history.
Track your 6610 for freeVersions: Generation I (1981–1986); Force II / Series II (1986–1989)
Service intervals
| Job | When |
|---|---|
| Engine oil and filter change | every 300 hours |
| Front wheel bearings: regrease | every 600 hours |
| Transmission and hydraulic oil and filter change | every 1,200 hours or every year |
| Power steering oil change | every 1,200 hours or every year |
| Front axle and hub oil change (4WD) | every 1,200 hours |
| Steering box oil change | every 1,200 hours |
| Coolant drain and refill | every 2,400 hours or every 2 years |
| Fuel filter elements change | when needed |
Service jobs and parts
Engine oil and filter change
Engine · every 300 hours
Kroon-Oil's recommendation for both 6610 generations gives an engine oil change every 300 hours. Change the filter with it every time.
| Part | Qty | Notes | Part number |
|---|---|---|---|
| Engine oil | 1 | SAE 10W-30 or 15W-40; ≈8.5 L plus ≈0.9 L for the filter. Aztec Oils match: EMPROTEC EHPD 10W-30 | check your handbook |
| Oil filter (spin-on) | 1 | Agriline 7082; crosses to 86546614, E8NN6714BA | 86546614 |
Step-by-step
- Run the engine to working temperature, then park on level ground, lower implements, stop the engine, take the key out and chock the wheels.
- Remove the sump plug and drain the hot oil. Wear gloves; hot oil burns. Refit the plug.
- Clean round the filter, unscrew it and make sure the old sealing ring has come off with it.
- Oil the new filter's seal and screw it on hand-tight.
- Refill to the top mark on the dipstick.
- Start the engine and check for leaks, stop it, wait a few minutes and recheck the level.
Tools: Drain tray (12 L), Spanner for sump plug, Filter wrench, Funnel, Rags, Gloves
Front wheel bearings: regrease
Front axle · every 600 hours
Kroon-Oil lists the front wheel bearing grease as a 50-hour check and a 600-hour change.
| Part | Qty | Notes | Part number |
|---|---|---|---|
| Wheel bearing grease | 1 | Lithium EP2 type. Aztec Oils match: VOLCATEC LITHIUM EP 2 | check your handbook |
| Hub seals | 2 | Check your handbook | check your handbook |
Step-by-step
- On level ground, apply the handbrake, chock the rear wheels, jack up one front wheel and put an axle stand under the axle.
- Remove the hub cap and strip the hub as your handbook shows.
- Clean the bearings, check them for wear and replace any that are pitted.
- Repack with grease, reassemble with new seals and set the bearing preload as your handbook says.
Tools: Jack and axle stand, Wheel chocks, Socket set, Solvent and tray
Transmission and hydraulic oil and filter change
Transmission · every 1,200 hours or every year
The 6610 uses one oil for the gearbox, rear axle, brakes and hydraulics. Kroon-Oil gives a change every 1,200 hours (and every 12 months on the Force II), with a level check every 50 hours. The hydraulic filter goes with it; no separate filter interval was found, so check your handbook.
| Part | Qty | Notes | Part number |
|---|---|---|---|
| Transmission/hydraulic oil | 1 | SAE 10W-30 tractor transmission oil; ≈53 L Gen I, ≈62–67 L Force II (see fluids). Aztec Oils match: AGRITEC UTTO | check your handbook |
| Hydraulic oil filter (spin-on) | 1 | Replaces Ford 84263773 (MKH Machinery listing for the 10 series) | 84263773 |
Step-by-step
- Park level, lower the linkage and any loader to the ground, stop the engine, take the key out and chock the wheels.
- With the engine off, move the lift and spool levers back and forth to relieve trapped hydraulic pressure.
- Let hot oil cool to warm before opening the drain plugs. Wear gloves.
- Remove the drain plugs and let all the oil drain. Refit the plugs.
- Unscrew the old hydraulic filter, clean the head, oil the new filter's seal and fit it hand-tight.
- Fill with new oil to the correct level on the dipstick or level plug.
- Start the engine, work the lift and remotes, then stop and recheck the level.
Tools: Large drain tray (70 L), Spanners, Filter wrench, Pump or large funnel
Power steering oil change
Steering · every 1,200 hours or every year
Kroon-Oil gives a power steering check every 300 hours and a change every 1,200 hours (and every 12 months on the Force II). Check your handbook for a steering filter.
| Part | Qty | Notes | Part number |
|---|---|---|---|
| Power steering oil | 1 | ATF. ≈2.2 L; check your handbook for the type | check your handbook |
| Power steering filter (where fitted) | 1 | 100 mm across | 83936985 |
Step-by-step
- Stop the engine, take the key out and chock the wheels.
- Clean round the reservoir, drain the old oil and change the filter if one is fitted.
- Refill with fresh oil.
- Start the engine and turn the steering lock to lock to drive out air, then stop and top up.
Tools: Drain tray, Spanners, Funnel
Front axle and hub oil change (4WD)
Front axle · every 1,200 hours
Kroon-Oil gives a front differential and hub reduction oil change every 1,200 hours, with a level check every 50 hours. There is no filter.
| Part | Qty | Notes | Part number |
|---|---|---|---|
| Gear oil | 1 | SAE 80W-90; ≈6 L differential plus ≈0.6 L (Gen I) or ≈1 L (Force II) per hub. Aztec Oils match: TRANSMATEC EP-4 80W-90 | check your handbook |
Step-by-step
- Park level, lower implements, stop the engine, take the key out and chock the wheels.
- Drain the differential housing, then turn each hub so its plug is at the bottom and drain it.
- Refit the drain plugs.
- Fill the differential to its level plug, and each hub to its level mark with the plug at the level position.
- Refit all plugs and wipe up spills.
Tools: Drain tray, Spanners, Oil pump or squeeze bottle
Steering box oil change
Steering · every 1,200 hours
Kroon-Oil gives a steering box oil check every 600 hours and a change every 1,200 hours.
| Part | Qty | Notes | Part number |
|---|---|---|---|
| Gear oil | 1 | SAE 80W-90, ≈0.8 L. Aztec Oils match: TRANSMATEC EP-4 80W-90 | check your handbook |
Step-by-step
- Stop the engine, take the key out and chock the wheels.
- Drain the steering box if it has a drain plug, or pump the old oil out through the filler.
- Refill to the level plug with fresh oil and refit the plug.
Tools: Small drain tray, Spanners, Oil can
Coolant drain and refill
Cooling · every 2,400 hours or every 2 years
Kroon-Oil gives a coolant change every 2,400 hours or 24 months for the Generation I 6610.
| Part | Qty | Notes | Part number |
|---|---|---|---|
| Antifreeze | 1 | 50% mix, ≈12.8 L system; check your handbook for the Ford specification | check your handbook |
Step-by-step
- Only work on a cold engine. If it is warm, wait, then open the radiator cap slowly to let pressure out.
- Drain the radiator and block, and dispose of the old coolant properly.
- Flush with clean water.
- Refill with 50% antifreeze and 50% water.
- Run the engine to warm up, let it cool and top up.
Tools: Drain tray, Hose, Antifreeze tester
Fuel filter elements change
Fuel · when needed
No interval was found in a reliable source; check your handbook. Agriline's 10 series service kit has two CAV-type fuel filters, so most 6610s have two elements.
| Part | Qty | Notes | Part number |
|---|---|---|---|
| Fuel filter elements | 2 | CAV 296-type, two per tractor (also 84535312, D0NN9N074B) | 83937061 |
Step-by-step
- Stop the engine, take the key out and chock the wheels. Keep naked flames away.
- Turn off the fuel at the tank.
- Remove the old elements and their sealing rings, and clean the filter heads.
- Fit new elements with new sealing rings.
- Turn the fuel on and bleed the filters, then the injection pump, using the bleed screws and the lift pump, until fuel comes out free of air.
- Start the engine and check for leaks.
Tools: Spanners, Container, Rags, Clean fuel
Oils, fluids and capacities
| System | Oil or spec | Capacity |
|---|---|---|
| Engine | Ford 4.4 L (268 cu in) 4-cylinder diesel | |
| Engine oil | Check your handbook for the Ford specification. Kroon-Oil lists SAE 10W-30 or 15W-40 diesel engine oil for normal use. | ≈8.5 L, plus ≈0.9 L in the filter (Generation I) |
| Coolant | ≈12.8 L; 50% antifreeze and water. Check your handbook for the Ford specification. | |
| Valve clearances | Check your handbook | |
| Transmission, rear axle and hydraulics (shared) | Tractor transmission/hydraulic oil, SAE 10W-30 type; check your handbook for the Ford specification | ≈53 L (Gen I, 8x2). Force II 8x2: ≈62 L (single-speed PTO, 2WD), ≈63.2 L (single-speed PTO, 4WD), ≈66 L (two-speed PTO, 2WD), ≈67.2 L (two-speed PTO, 4WD) |
| Front axle differential (4WD) | SAE 80W-90 gear oil; check your handbook | ≈6 L |
| Front hub reductions (4WD), each | SAE 80W-90 gear oil; check your handbook | ≈0.6 L (Gen I), ≈1 L (Force II) |
| Power steering | Check your handbook (Kroon lists ATF Dexron II-D) | ≈2.2 L |
| Steering box | SAE 80W-90 gear oil; check your handbook | ≈0.8 L |
| Belt pulley (where fitted) | As transmission | ≈1.1 L |
| Brakes | Wet disc, run in transmission oil | — |
| Fuel tank | Diesel | ≈79.5 L (21 US gal) |
Specifications
| Engine power (gross) | 82 hp (61.1 kW) |
| PTO power (tested) | 72.3 hp (53.9 kW) |
| Rated engine speed | 2,100 rpm |
| Weight | ≈2,580–3,310 kg (5,695–7,300 lb) |
| Tyres (common) | Front 7.50-16, rear 16.9-30 |
| Tyre pressures | Check your handbook |
| Linkage | Category II; lift 1,876 kg at 610 mm |
| Hydraulic system pressure | 2,500 psi (172 bar); pump 36.7 L/min |
| PTO | Independent, 540 rpm standard, 540/1,000 optional |
| Transmissions | 8x2, 8x4 synchro, 16x4 Dual Power, 16x8 synchro Dual Power |
Known problems
Dual Power slipping
Dual Power units wear their clutch discs and, less often, seals at the back of the unit. Test it under real load by flicking the switch while pulling something heavy.
Porous engine block
Owners report that some 10 series blocks went porous, depending on the year. Check the engine oil for coolant (milky oil) before buying.
Synchro wear
On the synchro gearbox, worn synchromesh is possible but owners say it is uncommon. Listen for crunching changes on a test drive.
Low oil in the rear axle
Owners say the rear axle is strong as long as it is kept full of oil. Check the transmission/hydraulic level every 50 hours.
Repair guides
- Gearbox and rear axle oil: separate levels, leaks and the right fluid (Easy, 30–60 minutes): Whining or grinding gears, a lift or independent PTO that is slow or weak when cold, wet brakes that chatter or squeal (4000, 5000, 6610), oil weeping from the brake cross-shaft or axle housings.
- Injection pump oil change (Simms in-line pump) (Easy, 30 minutes): Pump oil overdue or never changed, oil in the pump smelling of diesel or very thin, oil or fuel-oil mix dribbling from the pump overflow pipe.
- Hydraulic lift weak, slow or won't hold (5000 and 6610) (Hard, 2–8 hours): Lift stalls under a heavy implement, will not lift at all, bobs in transport, or lifts only sometimes. On the 6610 the Load Monitor or auxiliary valves may also be involved.
- Clutch pedal free travel: grinding gears, clutch drag or slip (Easy, 30 minutes): Gears grind with the pedal fully down, the tractor creeps in gear, the clutch slips or smells, or the pedal has no free play.
- Dual Power slipping or not changing range (6610) (Specialist, 1–2 hours to test; 2–3 days if the tractor must be split): Engine revs rise but the tractor slows when you flick into underdrive or back to direct under load, no change when the switch is pressed, or the unit slips when hot.
- Independent PTO slipping, not engaging or not stopping (Hard, 2–4 hours to test; a split is needed to overhaul the clutch): PTO slips under load, will not engage, will not disengage, or keeps turning after it is switched off.
- Coolant in the oil: porous block or head gasket check (6610) (Specialist, 1–2 hours to diagnose): Milky or rising engine oil, coolant loss with no outside leak, white smoke, bubbles in the radiator.
- Crunching gear changes on the synchromesh gearbox (6610) (Specialist, 1 hour for checks; gearbox repair is a split and strip): Crunch or grind when changing between synchronised gears, a gear that is hard to select, or one that jumps out.
- Clutch replacement: splitting the tractor (5000 and 6610) (Hard, 2 days): Clutch slips with correct free travel, judders, will not free, or the release bearing squeals.
- Wet disc brakes: adjustment and overhaul (4000, 5000, 6610) (Hard, 1 hour to adjust; 1–2 days to overhaul both sides): Pedals go too far, uneven braking or pulling to one side, brakes that fade, grab or chatter, oil leaking at a brake rod seal.
- Water pump and thermostat replacement (Moderate, 3–5 hours (the radiator comes out for the pump)): Coolant dripping from the pump weep hole, a growling or wobbly fan pulley, overheating, or an engine that never warms up.
- Head gasket replacement (5000 and 6610, 4-cylinder) (Hard, 7–9 hours): Steady bubbles in the radiator with a warm engine, coolant loss, white smoke, oil and coolant mixing.
- Injector removal, testing and setting (5000 and 6610) (Moderate, 2–3 hours (testing needs a nozzle tester)): Misfire or knock on one cylinder, black smoke, hard starting, loss of power.
- Bleeding the diesel fuel system (Easy, 20–40 minutes): Engine will not start or dies after a filter change, running out of fuel, or work on the pump or pipes; engine starts then stops; misfire after a fuel leak.
- Injection pump: timing check, removal and refitting (Specialist, 2–4 hours): Hard starting, knocking, heavy smoke or lack of power after other faults are ruled out, or the pump must come off for repair.
- Power steering heavy, jerky or noisy: fluid, bleeding and pressure check (Moderate, 1–3 hours): Steering heavy one or both ways, jerky or noisy pump, foaming fluid, assist that comes and goes.
- Starter motor: slow cranking, clicking or not engaging (Moderate, 1–3 hours): Engine cranks slowly, the starter clicks but does not turn, the pinion spins without engaging, or it grinds on the ring gear.
- Battery not charging: generator, alternator and regulator checks (Moderate, 1–3 hours): Charge warning light stays on, battery goes flat, ammeter shows discharge, lights dim with the engine running, or the battery boils (overcharging).
- Front axle: spindle bushings, pivot pin and toe-in (2WD) (Moderate, 3–6 hours): Front wheels wobble or shimmy, uneven front tyre wear, knocking over bumps, steering wanders, play when the wheel is rocked top to bottom.
- Four-wheel-drive front axle: kingpins, bearings and toe-in (6610) (Hard, 4–6 hours per side): Play when the front wheel is rocked top to bottom, clunking on lock, heavy or notchy steering, uneven front tyre wear.
The full step-by-step guides are in Farmyard Workshop once you add your tractor.
Parts list with genuine part numbers
Ford 6610 4-cyl ag tractor 10 series (01/81 - 12/08), MyCNH GB New Holland parts catalogue (selected assemblies; several pages cover the whole 10 series, rows limited to 6610 or generic parts)
Fuel filter
| Part | Part number | Qty | Notes |
|---|---|---|---|
| Fuel filter element kit, single bowl (includes seal and O-ring; to Nov 1986) | 83937061 | 1 | Wear part |
| Fuel filter head cover, single filter (to Nov 1986) | D9NN9165BA | 1 | |
| Fuel filter bowl (to Nov 1986) | C7NN9162B | 1 | |
| Fuel filter sealing ring 77.8 x 84.8 x 3 mm | 83914036 | 1 | Wear part |
| Fuel filter sealing ring (to Nov 1986) | D8NN9D325BA | 1 | Wear part |
| Fuel filter bowl O-ring | 49886 | 1 | Wear part |
| Fuel filter bowl plug | 81825360 | 1 | |
| Fuel filter head cover, dual filter (to Nov 1986) | D9NN9165AA | 1 | |
| Fuel filter bowl, dual filter | D3NN9162A | 1 | |
| Fuel filter O-ring, dual filter | 87006S92 | 1 | Wear part |
Air cleaner
| Part | Part number | Qty | Notes |
|---|---|---|---|
| Air cleaner assembly 3 in, 5110/5610/6410/6610/7610 | E0NN9600EF12M | 1 | |
| Air cleaner assembly 3 in, dry type with deluxe pre-cleaner | E0NN9600VB12M | 1 | |
| Air cleaner assembly 3 in, 6610O orchard (NHNA only) | E6NN9600AB12M | 1 | |
| Air filter outer element 95.3 x 169.9 x 384.1 mm (6410, 6610 type) | 81866927 | 1 | Wear part |
| Air filter outer element, 15-1/4 in (5610, NHNA only) | E9NN9B618AA | 1 | Wear part |
| Air filter inner element 74.7 x 93.7 x 352.55 mm | D1NN9R500A | 1 | Wear part |
| Air filter inner element (5110, 5610 and later use) | 86525008 | 1 | Wear part |
| Air cleaner dust valve | 81870839 | 1 | Wear part |
| Air cleaner cap 3 in (6610, 7610, 6710, 7710) | F2NN9B646AA12M | 1 | |
| Air cleaner restriction switch | 82003527 | 1 | |
| Air intake outlet tube (6610) | 82012560 | 1 | |
| Air intake outlet tube (6610, 6610O) | 86533730 | 1 | |
| Air cleaner inlet extension 3 x 20 in (6410, 6610, 6810, 7610) | D6NN9B691A | 1 | |
| Air pre-cleaner assembly 3 in | 82980264 | 1 | |
| Air pre-cleaner assembly 3 in (alternative) | 82926173 | 1 | |
| Pre-cleaner bowl 2-1/4 and 3 in | 73533 | 1 | Wear part |
Cooling
| Part | Part number | Qty | Notes |
|---|---|---|---|
| Radiator assembly (6610, all except listed) | E0NN8005GC15M | 1 | |
| Radiator drain cock | 81465471 | 1 | |
| Thermostat 203F / 93C | 87800842 | 1 | Wear part |
| Thermostat housing | E6NN9K457AB | 1 | |
| Thermostat housing gasket 0.8 mm | E9NN8255AA | 1 | Wear part |
| Upper radiator hose 38.86 x 114.3 mm (5610, 5900, 6610, 7610) | E6NN8260CA | 1 | Wear part |
| Radiator cap 7 lb | 76896 | 1 | Wear part |
| Radiator cap 13 lb | E5TH8100AA | 1 | Wear part |
| Radiator fan shroud (6610, low cab) | E0NN8146EC | 1 | |
| Radiator fan shroud (5610, 6610, with A/C) | E6NN8146AA | 1 | |
| Radiator hose clamp 50-65 mm | 82012728 | 4 | Wear part |
| Water pump repair kit, single pulley | EGPN8591DA | 1 | Wear part |
| Water pump repair kit, double pulley | EGPN8591CA | 1 | Wear part |
| Water pump repair kit, single pulley (later) | FAPN8591DD | 1 | Wear part |
| Water pump repair kit, double pulley, viscous fan | FAPN8591GG | 1 | Wear part |
PTO
| Part | Part number | Qty | Notes |
|---|---|---|---|
| PTO clutch assembly | E0NNN751BB | 1 | |
| PTO clutch piston | F1NNN786AA | 1 | |
| PTO clutch piston O-ring | 83416992 | 1 | Wear part |
| PTO clutch seal 132.69 x 149.22 mm | C0NN7A548A | 1 | Wear part |
| PTO clutch spring | D7NNC732A | 1 | |
| PTO clutch plate piston | 9824099 | 1 | |
| PTO drive clutch hub 23T/52T (5610, 6610) | F1NNN750BA | 1 | |
| PTO clutch oil seal (split) 55.24 mm | 81809513 | 3 | Wear part |
| PTO shaft 21T/25T | 82002444 | 1 | |
| PTO gear 25 teeth 540 rpm | D1NN745B | 1 | |
| PTO gear 650 rpm (5610, 6610, 6710) | D1NN745C | 1 | |
| PTO bearing 30 x 72 x 19 mm | 46805 | 1 | Wear part |
| PTO driven gear 81 teeth | E8NNA726AA | 1 | |
| PTO tapered bearing 41.27 x 73.46 mm | 86512015 | 1 | Wear part |
| PTO seal kit (to Sep 1989) | C5NNN710B | 1 | Wear part |
| PTO control handle (low cab) | E0NNN748AC | 1 | |
| PTO output shaft needle bearing | D8NNB734AA | 1 | Wear part |
Clutch
| Part | Part number | Qty | Notes |
|---|---|---|---|
| 12 in clutch disc assembly (5610, 6610, 6710) | E7NN7550DA | 1 | Wear part |
| 12 in clutch pressure plate and cover assembly | E0NN7563CA | 1 | Wear part |
| Clutch release bearing assembly 63.5 x 103.38 mm | 82010859 | 1 | Wear part |
| Clutch hub | E1NN7571CB | 1 | |
| Clutch spring, light green/black | D1NN7572A | 8 | |
| Clutch spring, dark blue/light green | E0NN7572CA | 8 | |
| Clutch ball bearing | F0NNN779AA | 1 | Wear part |
Sources
- Fuel filter 83937061 for the 6610 (UK specialist)
- Power steering filter 83936985 for the 6610 (UK specialist)
- Capacities and change intervals per component, Generation I (Kroon-Oil lubricant recommendation)
- Capacities and change intervals per component, Force II (Kroon-Oil lubricant recommendation)
- Power, fuel and hydraulic capacity, hydraulics, tyres, linkage, PTO, transmissions
- Engine size, oil and coolant capacity
- Spin-on oil filter and cross-references (fits 6610)
- Hydraulic oil filter 84263773 (fits 6610)
- 10 series filter kit FSK701 (spin-on oil, two CAV fuel, inner and outer air filters)
- Dual Power, synchro and block checks (owner reports)
- MyCNH GB store parts catalogue, guest browse
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