TSE DPT40-B, Руководство пользователя

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Series 90 Troubleshooting 7
7.4 System Will Not Operate in Either Direction
Item Description Action
7.3 Transmission Operates Normally in One Direction Only
Item Description Action
1. Check input to pump
control.
2. Check pump displace-
ment control.
3. Interchange system
pressure limiters, high
pressure relief valves,
and system check
valves.
4. Check charge pres-
sure.
Input to control module is operating
improperly.
Control linkages are not secure, con-
trol orifices are blocked, etc.
Interchanging the multi-function
valves will show if the problem is
related to the valve functions con-
tained in the multi-function valves.
If charge pressure decays in one
direction the loop flushing valve may
be “sticking” in one direction.
Check control input and repair or replace
as necessary.
Repair or replace control module as neces-
sary (8.2 and 9.3).
Interchange multi-function valves. If the
problem changes direction, repair or re-
place the valve on the side that does not
operate (8.1.2 and 9.2.1).
Measure charge pressure in forward and
reverse (4.2). If pressure decays in one
direction, inspect and repair the motor loop
flushing valve (9.4.1.1).
1. Check oil level in reser-
voir.
2. Check input to pump
control.
3. Check pump displace-
ment control.
4. Ensure bypass valve(s)
are closed.
5. Check charge pressure
with pump in neutral.
6. Check charge pressure
with pump in stroke.
7. Inspect pump charge
relief valve.
8. Check charge pump
inlet filter.
Insufficient hydraulic fluid to supply
system loop.
Input to control module is operating
improperly.
Control linkages are not secure, con-
trol orifices are blocked, etc.
If bypass valve(s) is open, the sys-
tem loop will be depressurized.
Low charge pressure insufficient to
recharge system loop.
Low charge pressure with the pump
in stroke indicates a motor charge
relief valve or system pressure relief
valve may be improperly set.
A pump charge relief valve that is
leaky or set too low will depressurize
the system.
A clogged filter will undersupply sys-
tem loop.
Fill reservoir to proper level.
Check control input and repair or replace
as necessary.
Repair or replace control module as neces-
sary (8.2 and 9.3).
Close bypass valves (8.1.3). Replace multi-
function valve if defective (9.2.1).
Measure charge pressure with the pump in
neutral (4.2). If pressure is low, go to step
6; otherwise continue with step 5.
Measure charge pressure with pump in
stroke (4.2). If pressure is low, adjust or
replace motor charge relief valve (8.3.1
and 9.4.1.2), otherwise go to step 9.
Adjust or replace pump charge relief valve
as necessary (8.1.1, 9.2.3)
Inspect filter and replace if necessary.
(continued)
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