Motor Grader Tandem Gear Pump – Section Order and Rotation Guide
This motor grader gear pump record should be treated as a tandem-pump identification task until the exact part number is confirmed. Front and rear sections may serve different circuits and cannot be swapped simply because the housings look alike.
Ordering basis: Confirm whether the original pump is tandem, the order of its sections, each port size, shaft interface and rotation.
Tandem-pump matching checklist
Photograph both pump sections and every oil port.
Record the order of the larger and smaller sections.
Confirm shaft type, rotation arrow and mounting pilot.
Trace which circuit is supplied by each section.
Why section order matters
Reversing section order or connecting ports incorrectly can produce slow steering, weak implements, overheating or excessive pressure. Low output may also be caused by suction leaks, worn couplings or contaminated oil.
Commission each circuit carefully
Pre-lubricate and prime the pump, verify hose routing and start at low load. Test the pressure and response of each supplied circuit separately, then monitor leakage, noise and temperature.
Product record
| Component | Tandem hydraulic gear pump |
| Part number | Not shown — verify from the original component or parts catalogue |
| Fitment rule | section order, rotation, shaft, port sizes, mounting pilot and circuit function |
Related product reference
Review the GR215 hydraulic pump identification page for another component-level identification workflow. The linked product is a reference only and does not establish interchangeability.
FAQ
Can the two pump sections be installed in either order?
No. Section displacement, circuit assignment, drive arrangement and port orientation must match the original assembly.
How can rotation be confirmed?
Use the original pump arrow, service documentation and the direction viewed from the shaft end; do not guess from hose position.
What causes one hydraulic circuit to be weaker than another?
A worn section, restricted suction, incorrect relief setting, internal leakage or wrong hose routing can affect one circuit.
Compatibility note: Confirm tandem configuration and every external interface before purchase.
