Description

Sandvik 56040645 Hydraulic Pump: a charge pump, and why it matters more than its size Most people searching for this number expect a big piston pump. The listings say something different.The Sandvik 56040645 Hydraulic Pump seems as a rate pump, a small pump that does a large task. When it fails, a device can lose drive completely, and the real damage lands on the primary pump it feeds. This guide explains what a charge pump does, how to check one and what to verify before you order. Advance Hydraulic Works works with hydraulic pump repair and supply from Delhi NCR, and this is how we’d go through it with you. What is the Sandvik pump 56040645? One parts-price site lists it as a Sandvik 56040645 charge pump, with a second reference 04697333, at a single price of $2,030.62, marked as available. That’s one overseas listing, so it isn’t your price, and “available” is the seller’s own claim. I couldn’t find a full specification for it: no displacement, no rotation, no mounting detail. So treat the charge pump label as a strong lead, and confirm it from the plate on your own pump. 56040645 pump:What does a charge do? Closed-circuit drives, such as tramming or travel drives, recirculate their oil between the pump and motor. They lose a little oil through leakage and need cool, clean oil constantly. A charge pump supplies that oil. It tops up the loop, keeps the main pump from starving, cools the circuit and often supplies control pressure too. It’s usually small and often sits on or inside the main pump. That’s why humans overlook it. When rate stress drops, the primary pump cavitates, the pressure is going susceptible or jerky and wear spreads fast. Signs the charge pump is the problem Look for these: • Weak or jerky drive. The machine hesitates or won’t pull. • Low charge pressure. The gauge reads below the machine’s specified value. • Noise. Whining or rattling from the main pump. • Hot oil. The loop isn’t being cooled and topped up. • Metal or debris in the filter. Something inside is wearing. Many closed-circuit pumps run charge pressure in the region of 20 to 30 bar, but the right figure depends on the machine, so use your manual’s value. The method: pressure first, then pump Pressure. Read charge pressure at the gauge port before you buy anything. Cause. Check the charge relief valve, the filter, the suction line and the oil level. A cheap fault often looks like a failed charge pump. Pump. Only if those are clear, move on to the charge pump itself. Verify. Match the replacement against the plate and the second reference number. A worked example These figures are a rule of thumb, no longer a spec. Say a closed-circuit pump of seventy one cc according to revolution turns at 1,800 rpm. Its flow is set 128 litres in keeping with minute. A charge pump is commonly sized at roughly a fifth of that, so around 25 litres per minute, which at 1,800 rpm means a displacement near 14 cc. Now suppose charge pressure is low. The charge relief valve is the cheapest suspect, then the filter, then the suction line. If those are fine and charge flow is clearly below what the pump should deliver, the charge pump is worn. Replacing only the main pump would just damage the next one. Check the number against your plate, because the real size will differ from this illustration. Why the second reference matters The listing pairs the Sandvik number with 04697333. A second number is a cross-reference you can use. Ask the seller what it refers to, and whether it matches your pump’s own plate. If the two numbers don’t agree with your plate, stop and ask. A charge pump that fits on paper but has the wrong displacement or rotation can starve or overfeed the loop. Implementation steps 1. Photograph the old pump, its nameplate and any tags earlier than removal. 2. Read charge pressure and note the machine’s specified value. 3. Check the charge relief valve, filter, suction line and oil level. 4. Write down every number on the plate, including any second reference. 5. Send the entirety to Advance Hydraulic Works and ask approximately availability. 6. Ask the vendor to country situation, source and warranty in writing. 7. Compare the delivered pump’s plate with your old one before fitting. 8. Flush the circuit, fit the pump, prime it, then start at low pressure and recheck charge pressure. The usual mistakes are replacing the main pump when the charge pump is at fault, ordering from the number alone and starting a dry charge pump. FAQs What is the Sandvik 56040645 Hydraulic Pump? One components-charge list calls it a charge pump, with a 2d reference quantity 04697333. Confirm the kind and length from the plate for your own pump. What does a price pump do? It tops up and cools the oil in a closed-circuit pressure and continues the primary pump from ravenous. It regularly substances manage strain too. How do I know if my rate pump has failed? Weak or jerky power, low charge strain, noise and hot oil are the standard symptoms. Check the relaxation valve, filter out and suction line first. Can Advance Hydraulic Works supply a 56040645 pump? Send the gadget details, part numbers and nameplate photographs to Advance Hydraulic Works and ask about availability, source and warranty earlier than you commit. Can a bad fee pump damage the primary pump? Yes. Low rate stress starves the primary pump, which can cause cavitation and fast put on. Your next step Read the charge pressure, photograph the nameplate and send everything to Advance Hydraulic Works. You’ll know whether it’s the charge pump before you spend anything.