Section 7 - Drive Train; Hydro Transmission Troubleshooting - Ariens 915055 Service Manual

7.1 HYDRO TRANSMISSION TROUBLESHOOTING

The following troubleshooting chart is to be used to
isolate hydro transmission problems and give possible
causes and corrective action responses.
TROUBLE
Axles Will Not Turn
Difficult Starting
Erratic Running
Jerky When Starting
Jumps Out of Gear
Knocking
Loss of Power or System
Noisy
Oil Leakage
Operates Hot
Operates in One Direction Only
Pump Failure
Speed Loss Under Load
Speed Loss Under Load
Will Not Drive
Will Not Shift
1 Inspect control linkage
2 Inspect acceleration valves
3 Inspect charge check valves
4 Incorrect grade of lubricating oil
5 Low cranking speed
6 Controls not in correct operation
position
7 Belts are missing, to tight, loose or
glazed
8 Overload of vehicle
9 Replacement parts damaged
10 Replacement parts improperly
installed
11 Improperly torqued attaching screws 32
12 Air in hydraulic system
13 Broken shifter stop
14 Inspect charge check valves
15 Inspect acceleration valves
16 Check oil level-gear box sump or
reservoir
17 Inspect heat exchanger
18 Inspect by-pass valve
19 Inspect charge pressure
20 Inspect inlet filter
21 Inspect charge relief valve

SECTION 7 - DRIVE TRAIN

POSSIBLE CAUSES
(Refer to Key Below)
1, 7, 8, 12, 16, 18, 28, 32, 38, 42
1, 6, 7, 8, 12, 16, 25, 26, 28, 38, 42
1, 4, 6, 7, 8, 12, 18, 25, 26, 28, 42, 55
1, 4, 7, 8, 12, 18, 28, 38
N/A
4, 8, 12, 18, 28, 37, 42
4, 12, 18, 28, 37, 42
4, 12, 18, 26, 28, 32, 37, 42
4, 22, 51, 16
4, 16, 28, 32, 35, 42
1, 8, 12, 30, 46
4, 12, 37
1, 6, 11, 28, 37, 51
1, 4, 7, 12, 18, 28, 26
1, 7, 8, 18, 28, 37, 38, 48
TROUBLESHOOTING KEY
22 Inspect hoses and lines for wear
23 Inspect implement relief valve
24 Inspect charge pump
25 Bad transmission pump
26 Overheating
27 Cold running
28 Bad transmission motor
29 Check system pressure
30 Shift rod grooves worn
31 Reverse chain broken
Damaged cooling fan
33 Inspect auxiliary relief valve
34 Inspect cooling fan
35 Inspect transmission cooling fins
36 Worn or damaged bearings
37 Metallic pieces or foreign objects in unit
38 Inspect for loosely mounted
components
39 Steering column loose or binding
40 Pressure relief valve sticking open
41 Pressure relief sticking closed
42 Broken relief valve spring
7 - 21
The troubleshooting key is generic and can be used for
several types of transmissions. Use only those
possible causes and corrective actions that apply to the
unit.
43 Burrs on gearing
44 Gears improperly installed
47 Shifting washer in backwards
48 Shifter/Brake shaft keyways damaged
49 Unit clutch not disengaging
50 Shifter stop assembled backwards
51 Improper fit of case to cover
52 Dowel pins not installed
53 Differential bevel gears broken
54 Spring in shifter weak or broken
55 Worn or stripped gear teeth
CORRECTIVE ACTION
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace