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B

PREVENTIVE MAINTENANCE

The following is a list of Preventive Maintenance measures that if followed will help

 keep your RANCO TRAILER in good working order and will result in a minimum of 

down time for your equipment.  

DAILY CHECKS – MAINTENANCE

In addition to the daily inspection items that are required or recommended 

under DOT Regulations and any inspections/checks required by the Company,

RANCO recommends that the following procedures be followed every day that

your trailer is in use.

DRAIN ALL AIR TANKS – Refer to Post Shift section of Operating Instructions in Owners 

Manual & Yellow Decal on Trailer.  

DRAIN AIR FILTER – Refer to General Lubrication & Maintenance in Owners Manual & 

Yellow Decal on Trailer.  

CHECK LUBRICATOR FLUID LEVEL  - Refer to General Lubrication & Maintenance in 

Owners Manual & Yellow Decal on Trailer. 

CHECK BOTTOM DUMP GATE OPERATION – Refer to General Operating Instructions

 in Owners Manual.  

GREASE 5TH WHEEL & KING PIN – Refer to General Operating Instructions in Owners 

Manual.  

WEEKLY CHECKS – MAINTENANCE  

GREASE GATE HINGES, AXLE CAM BUSHINGS & SLACK ADJUSTERS - Refer to 

General Lubrication & Maintenance in Owners Manual & Yellow Decal on Trailer.  

ADJUST AND LUBRICATE TARP – Refer to Tarp Maintenance Section of General 

Lubrication & Maintenance in Owners Manual.  

CHECK TIRE PRESSURE WITH GAGE – Refer to Tire Maintenance Section of General 

Lubrication & Maintenance in Owners Manual.  

MONTHLY CHECKS – MAINTENANCE  

CHECK SUSPENSION FOR CRACKS, WEAR & TORQUE VALUES – Refer to 

Suspension Section of General Lubrication & Maintenance in Owners Manual & Suspension 

Torque Requirements Decal on Suspension Sub-Frame. 

Bottom Dump

Trailer Scheduled Maintenance

The following is a list of Scheduled Maintenance measures that if followed will help 

keep your RANCO TRAILER in good working order and will result in a minimum of 

down time. These Scheduled Maintenance procedures are best performed at your 

DEALERS shop unless you have a qualified shop of your own capable of handling these 

procedures.  

AFTER 1st MONTH OF USE

TARP ADJUSTMENT - The cables and the tarp material tends to stretch once you start 

using the trailer. It is very important that the slack be taken out of the cables properly during

 this first check. -Refer to Tarp Adjustment Section on BACK of this page for adjustment 

recommendations.  

CHECK TORQUE ON ALL SUSPENSION FASTENERS - Once the trailer is placed in 

service; the fasteners stretch slightly and may loose the torque values that were applied at 

the factory. It is important that these torque values be maintained in order for the suspension

 to operate properly. The proper torque values for your suspension are listed in the Suspension 

Fasteners Section on BACK of this page and on a Decal attached to the sub-frame of your trailer.

CHECK TORQUE ON ALL WHEEL END FASTENERS - The wheel end fasteners stretch

just like the suspension fasteners, and the torque should be checked after the ~ month of 

service. Refer to Wheel End Fasteners Section on BACK of this page for proper torque values 

for different styles of wheels.  

GREASE GATE HINGES, AXLE CAM BUSHINGS & SLACK ADJUSTERS - Proper 

Lubrication is most important in the operation of any type of dump trailer and a regular 

schedule should be set up and maintained. -Refer to Grease Section on BACK of this page, Page 

1-4 & 1-5 of this Manual & Yellow Decal on Trailer.  

CHECK FOR PROPER ADJUSTMENT AND OPERATION OF BRAKES - The air brake system

 is always set and checked at the factory, but after being in use for a short period of time 

problems may show up, so brakes should be checked after 1 month and every 6 months after 

that. - Refer to Air Brake Section on BACK of this page for the proper method of checking 

brake wear & settings.  

CHECK FOR PROPER OPERATION OF GATE SYSTEM - Refer to Operation of Gate 

System Section on BACK of this page.  

CHECK TIRES FOR PROPER INFLATION AND WEAR - Refer to Tire Section on BACK of 

this page for proper inflation and tread depth information. 

AFTER 6 MONTHS OF USE - REPEAT ALL CHECKS FROM 1st MONTH  

AT 1 YEAR OF SERVICE - REPEAT ALL CHECKS FROM 6 MONTHS OF SERVICE  

For a printable version of the following work sheet click here

SCHEDULED MAINTENANCE WORK SHEET

CHECK TORQUE ON ALL SUSPENSION FASTENERS:

H-9700 (4 SPRING OR REYCO 886 SPRING SUSPENSION:

CHECK TORQUE ON ALL WHEEL END FASTENERS:

GREASE GATE HINGES~ AXLE CAM BUSHINGS & SLACK ADJUSTERS:

CHECK FOR PROPER ADJUSTMENT AND OPERATION OF BRAKES:

CHECK FOR PROPER OPERATION OF GATE SYSTEM:

CHECK ALL TIRES FOR PROPER INFLATION AND EVEN WEAR PATTERN:

Check Inflation                                See instructions on tire for proper inflation

Check Tread Depth                          (Min. 4/32 Required)

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