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US eBay has a functioning secondhand market for Danfoss hydraulic pumps. Prices are substantially below new, parts availability for discontinued models is often better than through official channels, and for a fleet maintenance manager who needs a specific unit quickly, it can solve a problem that the regular supply chain cannot. It can also produce an expensive disappointment. Understanding which listings to trust and which to avoid requires knowing what to look for — and what to ask.
What Legitimate Listings Look Like
Sellers with credible used Danfoss pump listings typically show photographs of the actual unit — not stock images — with the nameplate visible. The nameplate should show the full model number, which for Series 90 units includes displacement code, port configuration, control option, and shaft specification. If the model number is partially obscured or the seller cannot provide it when asked, that is an immediate red flag.
Legitimate industrial surplus comes from equipment that was decommissioned, not failed. A pump pulled from a machine that was retired or reconfigured will typically show even wear consistent with service life. A pump pulled from a failed machine may have contamination damage, scored bores, or bent shafts — damage that is not visible externally and only becomes apparent after installation.
Key Questions to Ask Before Buying
|
Question |
Why It Matters |
Red Flag Answer |
|
Why was the pump removed? |
Identifies failure vs. surplus |
'Machine broke down' |
|
Can you share the full model number? |
Confirms the unit is what they claim |
Refusal or partial answer |
|
How many hours of service? |
Estimates remaining life |
Unknown or suspiciously low |
|
Was the oil clean when removed? |
Contamination history |
'Not sure' or 'Looked dark' |
|
Is the shaft undamaged? |
Shaft scoring ruins new seals |
Cannot verify / won't check |
The Seal Kit Reality for Used Pumps
Any used Danfoss hydraulic pump should receive a full seal kit replacement before installation, regardless of what the seller says about its condition. Seals that have completed a service cycle are thermally fatigued even if they are not visibly worn — their elastic memory is compromised, and they will leak under pressure cycling in a way that new seals will not. A hydraulic pump seal kit is cheap insurance on a used pump purchase.
HOVOO / HOUFU supplies Danfoss hydraulic pump seal kits for Series 90, Series 26, and other commonly traded platforms on the US secondhand market. Fit a HOUFU kit before the pump goes into service. Details at hovooseal.com.
Source: www.hovooseal.com
