Description

Sandvik 77794226 71cc tramming hydraulic pump: what the number and the size mean When a drill rig can’t move, the tramming pump is the first suspect. It’s the pump that drives the machine between faces, and when it fails, the whole rig sits idle. If you’re searching for the Sandvik 77794226 71cc tramming hydraulic pump, you probably already know that. What’s less clear is what the number, the 71cc and the word “tramming” tell you, and what to check before you buy. Advance Hydraulic Works imports and trades hydraulic pumps from Delhi NCR, and this is how we’d walk through it with you. What is a tramming pump? Tramming pattern moves a drilling machine between workstations. The tramming pump enables a hydraulic drive for that trip. Many Sandvik rigs have this closed-circuit piston pump, designed to provide a clean, reversible, over-tension drive. When wearing it, the machine slows down, struggles on slopes or can’t flow in any respect. What is the Sandvik 77794226 pump? A rebuilt pump dealer lists this as a Sandvik DD210 tramming pump, listed as Rexroth A4VG71 under reference 77794226, totally rebuilt, tested and equipped with a warranty; it fits the “71cc” for your search. Seventy-one after A4VG in Rexroth’s designation generally re-specifies the length of the pump in cubic centimetres corresponding to revolutions, so 71cc. Confirm that when it contradicts the manufacturer’s information on your actual model. A Sandvik 77794226 pump additionally appears in a European market list of Sandvik hydraulic pump numbers, next to 77794227 a parts supplier notes 77794226 and 77794227 as dual pumps in certain configurations, with 77794226 as a single reference so test that your equipment uses one pump used or a couple. Sandvik 77794226 hydraulic pump: new, rebuilt or aftermarket Listings for this number come in three kinds: • Rebuilt. The South African listing above sells a rebuilt, tested unit with a warranty at 45,000 rand on sale, down from 54,000. • New or “OEM quality.” A European seller lists a Sandvik hydraulic pump under 77794226 and 77794227 at €5,819 excluding VAT and shipping, weighing about 40 kg. • Used or aftermarket. These vary widely and need the most checking. These are overseas prices and aren’t yours, since Indian duties and freight are extra. The point is that rebuilt and new are very different products, and both can be fine if the seller says what you’re getting. Why the 71cc size matters Displacement units how much oil the pump moves in line with turns. At seventy one cc, according to revolution and a pressure speed of 1,800 rpm, theoretical flow is seventy-one × 1,800 = 127,800 cc a minute, approximately 128 litres according to minute. At 250 bar, hydraulic electricity is more or less 250 × 128 ÷ six hundred, approximately 53 kW. A smaller pump would make the rig slower, and a larger one wouldn’t fit the drive. That’s why displacement can’t be “close enough”. This is illustrative arithmetic, not a spec sheet, so check it against the real model data and your machine’s drive speed. The method: function, size, configuration, condition Function. Confirm it’s the tramming pump, not a work-circuit pump. Size. Check the 71cc size on the pump’s nameplate, not just in the listing. Configuration. Find out whether your machine uses a single pump or a dual setup. Condition. Ask whether it’s new, rebuilt, used or aftermarket, and who gives the warranty. A worked example Say you receive two offers. One is a rebuilt unit with a written warranty and test results. The other is a cheaper unit with no photos of the nameplate. Ask the second seller three things: which exact model code is on the plate, what’s the condition, and where was it sourced? If they can’t answer, the saving isn’t worth it. Now add downtime. If the rig sits idle for three extra days, the loss can exceed the price difference. The cheapest listing isn’t always the cheapest outcome. This is an illustrative comparison, not a quote. Implementation steps 1. Photograph the old pump, its nameplate and any tags before removal. 2. Write down every number on it, the machine model and serial number. 3. Note whether the machine runs one or two trunnion pumps. 4. Send everything to Advance Hydraulic Works and ask about availability. 5. Ask the seller to state the condition, source, test results and warranty in writing. 6. Ask for photos of the actual unit’s nameplate. 7. Compare the delivered pump’s plate with your old one before fitting. 8. Flush the circuit, match the pump, fill and bleed it properly and begin at low pressure. The regular errors are ordering from the variety by myself, skipping the nameplate test and starting a brand new closed-circuit pump without bleeding it. FAQs What is the Sandvik 77794226 71cc tramming hydraulic pump? It’s a tramming pump listed under Sandvik reference 77794226, catalogued by one seller as a Rexroth A4VG71 for a DD210 rig. The 71 refers to a 71 cc per revolution size. What does a tramming pump do? It drives the machine’s travel between work positions. If it wears, the machine slows or won’t move. Is the Sandvik 77794226 hydraulic pump similar to 77794227? They seem collectively in listings, and one vendor calls them twin pumps in a few configurations. Ask the seller to show the go-reference. Can Advance Hydraulic Works supply a Sandvik 77794226 pump? Send the machine information, part numbers and nameplate images to Advance Hydraulic Works and ask about availability, source and guarantee before you commit. Should I buy rebuilt or new? Either can be fine. Ask for test results and a written warranty with a rebuilt pump, and ask for proof of origin with a new one. Your next step Photograph the nameplate, note whether your machine runs one pump or two and send everything to Advance Hydraulic Works. You’ll know what you’re buying before you spend anything.