PDX 750/ PD 550

PDX 750/ PD 550

Applies to:
ET-PDX-750
ET-PDX-750C
ET-PDX-750T
ET-PDX-750CT
ET-PDX-750-EX
ET-PDX-750-EX-T
ET-PD-550
ET-PD-750

Arrowhead Power cell common issues:

Charge Pressure for PDX-750
26 bar
360psi

Charge Pressure for PD-550/750
20 bar
290 psi

Charge Pressure for PDX-1000
17 bar
250psi

Valve Body bolts broken
Bolts are M8-1.25 x 80mm Grade 12.9
Fastenal P/N: 1139598
Install with Red-Loctite and torque to 29 ft/lb

Grease port turned/spun
This means that the bolts that hold on the lower portion of the drive cell have broken. 
Bolts are M12-1.75 x 12mm Grade 12.9
Fastenal P/N: 0154274
Install with Red-Loctite and torque to 87 ft/lb
To access these bolts the drive cell will have to be pulled out of the orange housing. There are 5 bolts/nuts holding the cap down on top of the drive housing. Remove these bolts, and remove the cap, and then the drive cell can be removed from the housing to access these bolts. 

Driver info for finding seal kits/parts:
PD 550 & BPD 550: S40 Drive Cell
      -Seal Kit Part Number: AR-S40-059
      S40 Tool Diameter - 65mm

PD 750 & BPD 750: R55 Drive Cell
      -Seal Kit Part Number: AR-1042401
      -Tool Retainer Pin - Part number depends on     

1042311

Tool Retainer Pin (19 mm OD)

Upto 55051705

1043311

Tool Retainer Pin (25 mm OD)

55051706 and up

      -R55 Tool Diameter - 53mm

PDX 750: E680 Drive Cell
      -Seal kit Part Number: AR-1161401
      -E680 Tool Diameter 68mm

PDX 1250: R75 Drive Cell
      -Seal Kit Part Number: AR-1151401



Complete seal kit for E680 - PDX 750 | Arrowhead - AR-1161401


As of 2021, the piston support rings were omitted from the seal kit.

The guidance is to reinstall the gas seal and U Seal at the top and the wiper along with the other remaining U Seal at the bottom end. Please note the orientation of the seals for installation purposes.

    • Related Articles

    • PDX-1000

      Changing out driver head: SG-DTR-DTP-240 - Replacement electrical / Attachment side