Service Manual

TX 413 Service Manual

9-13

TESTING

Rev. 000

8. Then turn the restriction valve to 1100 psi (76 bar)

(Fig. 560).

Figure 560 DSC-2942

9. At 1100 psi (76 bar), note the gpm reading.

Example:

• 300 psi (21 bar) reading 8 gpm (30 l/min)

1st reading

• 1100 psi (76 bar) reading 6.5 gpm (24.6 l/min)

2nd reading

1.5 gpm (5.6 l/min)

(the difference)

Subtract the ﬁ rst gpm reading from the second gpm

reading. This will determine your "ﬂ ow droop".

Note: The acceptable gpm "ﬂ ow droop" or

(difference) is 1.5 gpm (5.6 l/min).

If the difference exceeds these values, the hydrostatic

pump droop is not acceptable.

If the values have been met, the issue would be in the

wheel motor. Refer to Wheel Motor Removal, page

8-16.

10. Disconnect the ﬂ ow tester and reconnect the

hydraulic lines when test is completed.

Note: Before reconnecting the hydraulic lines,

install new O-rings in the ﬁ ttings.