Hydro-Gear 310-0510, Service And Repair Manual

310-0510 IHT 

9 

SECTION 4. SERVICE AND MAINTENANCE 

NOTE:  Any servicing dealer attempting 
a warranty repair must have prior 

approval before conducting maintenance 
of a Hydro-Gear

®

 product unless the  

servicing dealer is a current Authorized 
Hydro-Gear Service Center. 

EXTERNAL MAINTENANCE 

Regular external maintenance of the 310-0510 
IHT should include the following: 

1.  Check the vehicle operator’s manual for 

the recommended load ratings. Insure 
the current application does not exceed 
load rating.

2.

Check oil level in accordance with

Figure 4 

Page 10. 

3.  Inspect the vehicle drive belt, idler pulley(s), 

and idler spring(s). Insure that no belt  
slippage can occur. Slippage can cause low 
input speed to the transmission. 

4. Inspect the transmission cooling fan for  

broken or distorted blades and remove any 
obstructions (grass clippings, leaves, dirt, 
etc.). 

5.  Inspect the axle parking brake and vehicle 

linkage to insure proper actuation and 

adjustment  of the parking brake. 

6. Inspect the vehicle control linkage to the  

directional control arm on transaxle. Also, 
insure the control arm is securely fastened 
to the trunnion arm of the transaxle. 

7. Inspect the bypass mechanism on the 

transaxle and vehicle linkage to insure it  
actuates and releases fully. 

SERVICE AND MAINTENANCE  
PROCEDURES

All the service and maintenance procedures 
presented on the following pages can be  
performed while the 310-0510 is mounted on 
the vehicle. Any repair procedures as 

mentioned in the repair section of this manual  
must be performed after the unit has been  
removed from the vehicle.  

FLUIDS

The fluids used in Hydro-Gear products have 
been carefully selected, and only equivalent, or 
better products should be substituted.  

Typically, an engine oil with a minimum rating 
of 9 cSt (55 SUS) at 230°F (110° C) and an API 
classification of SL is recommended. A 20W-50 
engine oil has been selected for use by the fac-
tory and is recommended for normal operating 
temperatures.  

FLUID VOLUME AND LEVEL 

Fluid volume information is provided in Table 3. 

Certain situations may require additional fluid to 
be added or even replaced. Refer to Page 4 
and Figure 4 for the proper fill port location. 
 
Fill the 310-0510 to the top of the oil fill port. 
 
Recheck the fluid level once the unit has been 
operated for approximately 1 minute. 
 
Purging may be required. Refer to the purging 
procedures on page 11.