More reasons

[Hydros]

1) The batteries are dead.

2) Your motor is fried.

3) You have a high resistance electrical connection.

4) You oil is too thick

5) Pump is too worn.  (here the motor would spin at it's normal rate, or even a little faster).

6) You are using only one battery

CONT:[/size]

[VOLV_LO]

Pump head is not tight enough...