Engaging the Bypass Function
It is possible to damage the drive motor(s) by operating in bypass mode without charge pressure.
Move the vehicle/machine at a speed not more than 20% of maximum for a duration not exceeding 3
minutes.
Use this procedure to bypass the pump (frame size 060/068 only to allow moving the vehicle/machine
short distances when you cannot start the prime mover.
Engaging the Bypass Function
1. To open the HPRVs (L150), rotate three revolutions counterclockwise using a hex wrench.
Caution
Do not rotate more than 3 revolutions, leakage will result.
2. Rotate them clockwise until seated to close the HPRVs.
See the following table for torque values:
HPRV Wrench Size and Torque Value
Frame size Wrench size Torque
045—100 22 mm 70 N•m [52 lbf•ft]
060—068 22 mm 70 N•m [52 lbf•ft]
115—250 30 mm 110 N•m [81 lbf•ft]
If machine is towable with HPRVs opened three turns and if wheels are locked (not towable) with HPRV
valves closed, bypass function is working correctly.
Service Manual
H1T 045/053, 060/068 Axial Piston Tandem Pumps
Adjustments
©
Danfoss | September 2020 AX152886481761en-000405 | 47
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