Excavator Hydraulic Pump 708-3S-00110 / 708-3S-00112 for Komatsu PC35, PC40, PC45MR-1 The PC40MR-1 is a Komatsu mini crawler excavator from the PC40MR/PC45MR platform. This hydraulic main pump is a tandem variable displacement piston pump that is fully integrated and includes a pilot pump (gear pump) . The PC40MR-1 and PC45MR-1 models share the same main pump configuration, while PC40MR-2/PC50MR-2 represent the newer generation. Common Faults & Symptoms Weak movement / slow