Bulletin Number:

SB-20-336

Release Date:

June 29, 2020

Distribution:

Heil Dealers, Heil Technical Services, Heil Customer Care

Subject:

Transmission Mounted Power Take-Off (PTO) Inspection and Preventive
Maintenance

NOTE: READ THIS BULLETIN IN ITS ENTIRETY BEFORE BEGINNING ANY REPAIR WORK.
Due to normal torsional vibrations of transmission mounted Power Take-Offs (PTOs), it is important that
Service Technicians include the PTO/transmission interface in their standard inspection and maintenance
schedules. If a PTO Inspection and Preventive Maintenance schedule is not followed, it is possible that the
PTO mounting screws can come loose, resulting in transmission fluid leaks between the PTO and
transmission and potential damage to the PTO or drivetrain.
This Service Bulletin describes the MONTHLY (200 HOURS OF OPERATION) Preventive Maintenance
procedure to check the torque on the PTO mounting screws and tighten to the proper torque specification, if
needed. This information will be added to the Preventive Maintenance charts in all Heil Service Manuals.

1.

PLANNING INFORMATION
A. Products Affected
This bulletin applies to any Heil unit with a transmission mounted PTO.

B.

Compliance
Each Dealer may perform these tasks as outlined in this Service Bulletin on an as needed basis.
The tasks outlined in this Service Bulletin must be performed by a qualified technician. There will be
no warranty reimbursement for Inspection and Preventive Maintenance tasks described in this
Service Bulletin.

C. Manpower
The labor effort required to accomplish the tasks in this Service Bulletin is shown in Table 1.
TASK

Table 1. Manpower

PTO/Transmission Interface Inspection/Preventive Maintenance

Copyright 2020, Heil Environmental

ESTIMATED MAN HOURS

0.5

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D. Tools, Materials and Parts Needed
The tools and materials necessary to perform the Inspection/Preventive Maintenance are shown in
Table 2.
Item
Personal Protective Equipment
Wrench/Socket Set
Torque Wrench
Marker

2.

Table 2. Tools and Materials
Part Number
Commercially available
Commercially available
Commercially available
Commercially available

Application
Safety protection as required by employer
To tighten PTO mounting 10mm 12 pt. head
screws
To properly tighten PTO mounting screws
To make witness marks on the PTO mounting
flange

PREPARING THE UNIT AND WORK AREA
Make sure that the unit is in Lock-Out/Tag-Out mode before performing re-work. Refer to and follow
your company’s Lock-Out/Tag-Out policies and procedures. At a minimum, refer to and follow the LockOut/Tag-Out procedure found in your Heil Service Manual. Always wear appropriate Personal Protective
Equipment as required by your employer (but to always include at a minimum, safety glasses and OSHA
approved hard-toed boots) when repairing a unit or performing scheduled maintenance on a unit. Clear
the work area around the unit of all unnecessary people and equipment.

3.

CORRECTIVE ACTIONS

With the unit prepared as described in Section 2 of this Service Bulletin, in Lock-Out/Tag-Out mode
with the hydraulic pressure relieved, carefully follow the steps below.

A.

PTO/Transmission Interface Inspection/Preventive Maintenance (MONTHLY/200 HOURS
OF OPERATION)
(1) Inspect for transmission fluid leaking from the PTO/transmission interface. Thoroughly clean
around this area.
(2) Using a torque wrench, check the PTO mounting screws. If they are set less than 45 FT-LBS,
tighten to 45 FT-LBS.
(3) Using an oil-resistant marker, add a witness mark on each screw head and across the PTO
mounting flange. For future inspections, this will help identify if the PTO mounting screws
loosen over time. See Figure 1.

Figure 1. Witness Marks on PTO Mounting Screws and Flange
Copyright 2020, Heil Environmental

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(4) Take the unit out of Lock-Out/Tag-Out mode and operate unit functions.
(5) Check for transmission fluid leaks around the PTO/transmission interface. If there are leaks,
contact Technical Services.
(6)

When there are no transmission fluid leaks, place the unit back into service.

If you have any questions regarding the information detailed in this Bulletin, please contact Heil Technical
Service at 866.310.4345.

Heil Environmental Service Bulletin procedures are intended for use by professional technicians, NOT a “do-it-yourselfer.” They are
written to inform experienced technicians of conditions that may occur on some units, or to provide information that could assist in the
proper servicing of a unit. Properly trained technicians have access to and are familiar with the applicable Heil Operation Manual
and Heil Parts and Service Manuals and have the equipment, tools, safety training, and know-how to do a job properly and safely. If a
condition is described, DO NOT assume that the Bulletin instructions apply to your unit, or that your unit will have that condition. See
your Heil Dealer to determine whether your unit may benefit from the information in this Service Bulletin.
This entire bulletin (and any attachments) is confidential and only for the intended recipient(s). Use or distribution by any unintended
recipient is prohibited. If you have received this bulletin in error, delete this entire communication, and notify the sender you have done
so.
Copyright 2020, Heil Environmental

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