John Deere 1986963C1 / 9 cc Tractor Hydraulic Gear Pump Replacement

Model identity and its limits

Before treating 1986963C1 as an interchangeable spare, compare the inlet-side and discharge-side hardware. Different bodies can share a family reference without sharing every connection.

No specific tractor serial ranges are established here for 1986963C1 / 9 cc. Use the parts manual and existing hardware to complete the application check.

Technical specifications

Close relatives are not identical

John Deere RE73947 / 30+14 cc can serve as a useful control example while sorting this catalogue family. Its 250 bar listing should not be transferred to 1986963C1 / 9 cc, for which the recorded value is 140 bar.

If the machine has been modified, the fitted pump is more useful evidence than a legacy tractor model number.

What the rated values mean

For the stated 9.0 ml/rev pump, the hydraulic system remains the limiting context. Mechanical fit alone is not a test of working flow or acceptable drive load.

Within the comparison set, RE73947 / 30+14 cc lists 30/14 ml/rev and 250 bar. That is a useful limit check for the 1986963C1 / 9 cc hydraulic request, not permission to alter the tractor’s original pump rating.

Controlled flow is shown as 6.0 L/min for this listing. Its circuit function should be reviewed before specifying a valve or control setting.

The stated speed is 500–3000 rpm. Before commissioning, verify the engine accessory drive ratio and that normal operating conditions do not exceed this listing.

Commissioning considerations

An installation review should include oil grade, tank venting and relief valve condition for 1986963C1 / 9 cc. If the previous pump failed from starvation or high pressure, replacement alone will not remove the cause.

An incorrectly seated shaft coupling may damage both drive and pump even at light load.

Connection geometry and handedness

The selection should rule out the opposite drive hand at the outset: 1986963C1 / 9 cc is CCW. Do not rotate a directional unit backwards to make its fittings line up.

Ø20 and Ø15 are the recorded feed/discharge connection values. A mistaken swap between inlet and pressure ports should be resolved on the bench.

Complete the pump identification

A useful request specifies 1986963C1 / 9 cc by OEM reference and includes the hydraulic system’s working duty. Supply the exact rotation convention and two views of the pump body.

Replacement evaluations can proceed faster when photographs show all sides rather than only the top cover.

What buyers ask about this model

Can different oil fittings be made to work with 1986963C1 / 9 cc?

Only after confirming the actual port thread or bore, sealing system and clearance. Do not assume an adapter makes a mechanically wrong pump correct.

How does 1986963C1 / 9 cc compare with John Deere RE73947 / 30+14 cc?

The comparison shows 30/14 ml/rev for the other part and 9.0 ml/rev here; rotation and mechanical interfaces must also be checked.

Ordering, samples and shipping terms

Order quantities are set according to pump type and total order value. A small order of 1–2 pieces can be considered at a higher unit price; new customers may request 1–5 samples when the item is suitable. Mixed-model orders are available, normally with a combined order value of approximately USD 1,500.

Typical production schedules are 10–25 working days for standard items, 20–45 working days for customized components, and 45–120 working days for project equipment. Usual delivery terms are EXW, FOB, CIF and DAP. FCA, CFR, CPT, CIP and DDP can be discussed for specific shipments. Confirm the final schedule and terms with the quotation.