Page 24
34-J Desel - Servce & Parts Manual
December 2021
Secton 10 - Hydraulc System
Art_5717B
G
Temperature
Sensor
Fe
T2
P
P
DA
DB
IN
M
T
T
T
O
T
DB
DA
T1
Drive Pump
(PMP)
Drive Pump
(Danfoss)
Functions Pump
(Rexroth)
Functions Pump
(Dynamic)
Port
Connection
Drive Pump
Port
Connection
DA
Drive Motor Port A
DB
Drive Motor Port B
Port
Connection
Functions Pump
P
Out To Pressure Filter
T
In From Hydraulic Reservoir
T1
Out To Hydraulic Reservoir
T2
Out To Hydraulic Reservoir
G
In From Charge Filter
Fe
Out From Charge Filter
Drive Pump
The Drive Pump provides fluid to power the machine’s Drive Function.
The Drive Pump must be filled with fluid and all air bleed out any time the pump is removed and re-
installed, or drained of fluid for any reason. To prime the pump, loosen the output hose fittings at the
hydraulic pumps to flood with hydraulic fluid. Tighten fittings.
Drive Pump Service
MEC does not recommend end-user maintenance or repair of the Drive Pump on the 34-J machines.
Contact MEC or PMP for the nearest service provider.
Functions Pump
The Functions Pump is a fixed-displacement gear pump. Power to functions is controlled by the
proportional valves, and unused pressure is returned to the tank.
The Functions Pump must be filled with fluid and all air bleed out any time the pump is removed and
re-installed, or drained of fluid for any reason. To prime the pump, loosen the output hose fittings at
the hydraulic pumps to flood with hydraulic fluid. Tighten fittings.
