Volvo A35G Articulated Hauler Parts - Hydraulic Pump, Control Valve and Hitch Wear List for Turkey
Why Turkish quarry haulers wear the hydraulic system first
Marble and aggregate sites in western Turkey run a duty cycle that punishes hydraulics more than engines: the loaded haul is uphill, so the body is tipped on a slope, ambient temperature sits above 35 C for four months, and dust from crushing plants coats every cooler core. A tipping cycle that should take 12 seconds stretches to 20, then to 30, and the operator compensates with throttle instead of investigating.
The real failure chain: cooler cores load up with dust, oil temperature climbs, viscosity drops, the main pump loses volumetric efficiency, tipping slows, the operator raises engine speed, oil temperature climbs further, seals harden, the control valve spools score, the body starts drifting down under load, and finally the hitch bearing takes the shock of a body that no longer holds position. The cost is not the part. It is a hauler parked on a slope with a full body and a loading shovel waiting.
| Item | Symptom on site | Free first check | Usual action |
|---|---|---|---|
| Main hydraulic pump | Slow tip, hot oil, weak steering | Time a full raise, measure case drain | Replace pump |
| Gear pump | Whine, steering stiff when hot | Compare noise cold vs hot | Replace gear pump |
| Control valve | Body drifts down, spool sticks | Hold body raised, watch drift rate | Replace valve |
| Rear hitch | Knocking on articulation, play | Pry test radial play | Replace hitch |
| Hitch bearing | Growl when turning, heat | Touch bearing housing after a shift | Replace bearing |
Hydraulic pump 17458128: measure before you replace
17458128 hydraulic pump (VOE17458128) is the main load sensing pump used across the A35G and A40G family. It feeds tipping, steering and the working hydraulics, so a worn pump shows up as three complaints at once and gets misdiagnosed as three separate faults.
Do these three checks before ordering. First, time a full body raise from idle and compare with the specification for the machine. Second, measure case drain flow at operating temperature; a worn pump returns far more oil than a healthy one. Third, cut the return filter open; bronze or bright metal means the rotating group has already started to fail and the whole circuit needs flushing.
When the pump is replaced, four things go together: new hydraulic oil and return filter, flushed tank and lines, relief pressure reset to specification, and cooler cores cleaned from the back. Most early failures of a new pump in Turkey trace back to a circuit that was not flushed or a cooler that was never cleaned.
Gear pump 15020177: the whine that predicts a steering failure
15020177 gear pump (VOE15020177) serves the steering and cooling circuits on A35F, A35G, A40F and A40G haulers. It is a small, cheap part that fails quietly, and when it does the first symptom is steering that gets stiff exactly when the oil is hottest, which is also when a loaded hauler needs steering most.
Diagnosis is simple: listen cold, listen hot. A gear pump that is quiet at start-up and whines after two hours has worn internally, and the noise is cavitation from air entrainment through worn shaft seals. Confirm by checking for oil mist around the shaft seal and by measuring steering pressure at idle and at relief.
Never replace the gear pump without checking the suction strainer and the reservoir breather. A blocked strainer will destroy a new pump within days, and in dusty Turkish sites the breather is the single most neglected item on the machine.
Control valve 17502017: body drift is a safety issue, not a nuisance
17502017 hydraulic valve is used on the A35G and A30G platforms to control the tipping circuit. When the spool or the load hold check wears, the body creeps down under load. Operators often accept it and keep the engine running to hold the body up, which overheats the oil and accelerates wear across the whole circuit.
Measure it properly: raise the body to full, stop the engine, and time the drift over five minutes. Small drift within specification is normal. Fast drift means the check valve or spool is leaking internally. Do not confuse this with a leaking cylinder: a cylinder leak shows oil at the rod seal, a valve leak shows no external oil at all.
Before fitting a new valve, check pilot pressure and the electrical signal to the tipping solenoid. A weak pilot supply makes a good valve behave like a bad one, and it is a ten minute check.
Rear hitch 16841151 and bearing 15061411: the articulation joint
16841151 rear hitch suits A35F, A35G and A40F haulers, and it works together with 15061411 hitch bearing. This joint carries the entire vertical load of a loaded body while the machine steers, so it sees reversing loads every cycle, not steady load.
Inspection sequence: park on level ground with the body down, pry test radial and axial play at the hitch, then touch the bearing housing after a working shift. A housing that is too hot to hold means the bearing is failing. Knocking during articulation with visible play means the hitch bore is already worn, and fitting only a bearing will not fix it.
Torque and lubrication matter more than most workshops admit. Hitch bolts are torque-to-yield on several A35G builds and must not be reused. Grease the joint every shift on dusty sites, not every week.
Lead time and how to order into Turkey
We ship Volvo hauler parts from Guangzhou to Istanbul and Izmir by air in 5 to 7 days, or by sea to Ambarli and Aliaga in 28 to 34 days. For a quarry running three haulers, the sensible stock is: one main pump, one gear pump, one control valve, one hitch and two hitch bearings.
To quote accurately we need three things: machine serial number, photo of the old part nameplate, and a short description of the symptom. With the serial number we can identify which pump and hitch variant the machine was built with. With the nameplate photo we avoid the classic error of shipping an A35F part for an A35G machine.
Supply note: we supply aftermarket parts suitable for Volvo equipment, not genuine Volvo parts. Part numbers are used for cross reference and identification only. Always confirm against the machine serial number and the old part nameplate before ordering.
Frequently asked questions about Volvo A35G parts
Will an A35F hydraulic pump fit my A35G?
Only if the serial number confirms the same pump family. A35F, A35G and A35G FS were built with more than one pump and hitch combination. Send the serial number and the old nameplate photo and we will cross check before shipping.
How do I know the main pump is worn rather than the valve?
Time a full body raise and measure case drain flow at operating temperature. A worn pump is slow to raise and returns excessive case drain. A worn valve holds pressure but lets the body drift down with the engine stopped.
The body creeps down slowly. Is that dangerous?
It is a safety issue once drift is fast, because anyone working under a raised body relies on the check valve. Measure drift over five minutes with the engine off. Fast drift means the valve needs replacement, not adjustment.
What causes knocking at the articulation joint?
Worn hitch bore or failed hitch bearing. Pry test for play with the body down. If there is visible movement, replace the hitch and bearing together, since a new bearing in a worn bore will fail within weeks.
Send the serial number, get fitment confirmed today
Aftermarket hydraulic, hitch and driveline parts for Volvo A35G haulers, in stock and shipped from Guangzhou.
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