Hi mapapada;
Let's see if we can work you through the road block with this 24 volt truck. With the power distribution panel cover off that in the truck's rear, look for the traction drive's control module on the right side as you are in the seat. You should see a rectangular 25 pin plug. As you are looking at this plug from outside rear end of the truck the No 1 pin is the top right side, and the No. 14 pin is the bottom right side. The pin's voltages are as follows:
1 BV +
2 BV - Right direction contactor FWR
3 BV - Left direction contactor FWR
4 BV - Steer curve switch feed
5 Open
6 BV - Feed to current sensor
7 Open
8 15 V+ for accel transmitter
9 BV - From temp switches of motors
10 BV + To enable drive from timer
11 BV - Single pedal FWR
12 Open
13 Open
14 BV - Right direction contactor REV
15 BV - Left direction contactor REV
16 BV - From steering left curve switch
17 Open
18 BV - From timer
19 BV 7.5+ to 11.6+ max REV_7.5+ to 3.1+ volts max FWR
20 varies from 7.5+ to 10.5+ depends on truck's load
21 Open
22 BV- With hand brake off and foot brake up
23 No BV readings if single pedal BV- if dual pedal
24 BV- If a single pedal if REV is demanded
25 24 BV+ from power supply

Hi there

I know some of the older linde trucks used to bring the direction contactors off the foot pedal. Have you checked foot pedal ms1 switch and voltage wipe?
Also some of the older ones used to prevent the direction contactors from energizing if they detected motor problems whether it be brush wear or earth leakage.