allen HDX750 Application guide

HDX750
056335; 01/12
Hydra-Drive Extreme (HDX) Series Riding Trowel
OPERATIONS-PARTS
MANUAL

056335; 01/12
This manual, or a copy of it, must be kept with the machine at all times.
There is a manual storage container located on the machine for your convenience.

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056335; 01/12
Riding Trowel
OPERATIONS-PARTS MANUAL
Copyright © 2011 Allen Engineering Corporation
All rights reserved
All information, specifications, and illustrations in this manual are subject to change without notice and are based
on the latest information at the time of publication. No part of this manual may be reproduced or transmitted in any
form or by any means, electronics or mechanical, for any purpose, without the express written permission of Allen
Engineering Corporation (AEC). AEC assumes no responsibility or liability for any errors or inaccuracies that may
appear in this manual.
Allen®Products are covered under one or more of the following patent numbers:
U.S. Design Patents: 344,736; 400,542; 400,544; 402,998; 402,999; 403,332; 404,041; 404,042; 410,931;
413,127; 416,564; 465,897; 466,909; 474,203.
U.S. Utility Patents: 5,108,220; 5,238,323; 5,328,295; 5,352,063; 5,405,216; 5,476,342; 5,480,257; 5,480,258;
5,533,831; 5,562,361; 5,567,075; 5,613,801; 5,658,089; 5,685,667; 5,803,658; 5,816,739; 5,816,740; 5,890,833;
5,934,823; 5,967,696; 5,988,938; 5,988,939; 6,019,433; 6,019,545; 6,048,130; 6,053,660; 6,089,786; 6,106,193;
6,857,815; 5,288,166; 6,582,153 B1.
Canadian Patents: 2,039,893.
With other Patents Pending.
First Issue: January 2012
AEC Manual Part No.: 056335
Printed in U.S.A.
This manual covers the HDX Hydraulic Riding Trowel(s) listed below:
Part No. Description
056122 RIDER, HDX750 V3307-DI-T-KEA

ii 056335; 01/12
Limited Warranty
LIMITED WARRANTY and LIMITATION OF LIABILITY
Allen Engineering Corporation ("Allen") warrants its products to be free of defects in material or workmanship for the following
periods:
A. New Machines and Parts .......................... One Year
B. Hydraulics .................................................. One Year
The above listed warranty periods are effective for Allen Machines with a first day of use by End User on April 1, 2007 or later.
Warranty period begins on first day of use by End User. This first day of use is established by the date of a completed Allen
Warranty Card or a Bill of Sale to the End User. All warranty is based on the following limited warranty terms and conditions,
including the disclaimer of implied warranties and consequential damages.
1. Allen's obligation and liability under this warranty is limited to repairing or replacing parts if, after Allen's inspection,
there is determined to be a defect in material or workmanship. Allen reserves the choice to repair or replace.
2. If Allen chooses to replace the part, it will be at no cost to the customer and will be made available to the Allen Distributor,
Dealer, or Rental Center from whom the End User purchased the product.
3. Replacement or repair parts, installed in the product, are warranted only for the remainder of warranty period of the
product as though they were the original parts.
4. Allen does not warranty engines. Engine warranty claims should be made directly to an authorized factory service center
for the particular engine manufacturer.
5. Allen's warranty does not cover the normal maintenance of products or its components (such as engine tune-ups and oil &
filter changes). The warranty also does not cover normal wear and tear items (such as belts and consumables).
6. Allen's warranty will be void if it is determined that the defect resulted from operator abuse, failure to perform normal
maintenance on the product, modification to product, alterations or repairs made to the product without the written approval
of Allen. Allen specifically excludes from warranty any damage to any trowels resulting from an impact to the rotors.
7. Impact damage is not covered under the Allen Gear Box warranty. (Not applicable on hydraulic drive machines.)
8. Allen will pay shop labor on warranty items at the Allen Shop Labor Rate in existence on the date of the warranty claim. An
Allen Labor Chart will determine the time allowed to complete a repair and will govern the shop labor hours that will be
allowed.
9. Allen will pay freight on warranty replacement parts at worldwide standard ground rates. No warranty replacement parts
will be shipped air freight at the expense of Allen. Allen only pays outbound freight charges when sending warranty
replacement parts to the customer via ground service. Allen does not pay any inbound freight. However, if Allen determines
this to be a warranted item, only then will Allen reimburse the customer for inbound freight at standard ground rates.
10. ALLEN ENGINEERING CORPORATION'S WARRANTY POLICY WILL NOT COVER THE FOLLOWING: TAXES; SHOP
SUPPLIES; ENVIRONMENTAL SURCHARGES; AIR FREIGHT; TRAVEL TIME; LOSS OF TIME; INCONVENIENCE;
LOSS OF RENTAL REVENUE; RENTAL COSTS OF EQUIPMENT USED TO REPLACE THE PRODUCT BEING
REPAIRED; LOSS OF USE OF THE PRODUCT; COMMERCIAL LOSS; OR ANY OTHER CHARGES WHATSOEVER OR
ANY LIABILITIES FOR DIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGE OR DELAY.
11. ALLEN ENGINEERING CORPORATION MAKES NO OTHER WARRANTY, EXPRESSED OR IMPLIED. THIS LIMITED
WARRANTY IS IN LIEU OF THE WARRANTY OF MERCHANTABILITY AND FITNESS. THERE ARE NO OTHER
WARRANTIES THAT EXTEND BEYOND THE DESCRIPTION ON THIS DOCUMENT.
12. No Allen employee or representative is authorized to change this warranty in any way or grant any other warranty unless
such change is made in writing and signed by an officer of Allen Engineering Corporation.

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056335; 01/12
Table of Contents
Sect No. Title Page
... Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ii
... Information Contained In This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . .v
... Dealer Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vi
... Ordering Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
... Model Number - Serial Number Codes . . . . . . . . . . . . . . . . . . . . . . . . . .viii
... Unit Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ix
... Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .x
... Engine Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xvi
... Machine Dimensional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .xii
... Sound And Vibration Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiii
... CE Declaration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiv
1.0 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
... State Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
... Federal Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
1.1 General Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
1.2 Spark Arrestor Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
1.3 Operating Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6 thru 1-7
1.4 Engine Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8
1.5 Servicing Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
1.6 Safety And Operation Labels . . . . . . . . . . . . . . . . . . . . . . . .1-10 thru 1-12
2.0 Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2.1.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
2.2.1 Before Starting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
2.2.2 Start-up Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
2.3.1 Operating the Trowel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
2.3.2 Stopping the Trowel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
2.3.3 Steering the Trowel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8
2.3.4 Pitch Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
2.3.5 Cold Weather Startup Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10
3.0 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
3.1 Periodic Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
3.2 Control Linkage Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
3.3 Lift Lever Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
3.4 Transporting Trowel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
3.5 Battery Jump Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9

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4.0 Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
... Factory Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
... Replacement Part Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
4.1 Seat Frame Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4 thru 4-9
4.2 Main Frame Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10 thru 4-13
4.3 Power Unit Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-14
4.4 Left Rotor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-16
4.5 Right Rotor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-18
4.6 Left Spider Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-20
4.7 Right Spider Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-21
4.8 Hydraulic Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-22
4.9 Electrical Harness Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-24
4.10 Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-26
4.11 Dolly Jack Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-27
Table of Contents, continued

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056335; 01/12
Information Contained in this
Manual
This manual provides information and procedures to safely operate and maintain the Allen
Machine.
For your own safety and protection from personal injury, carefully read, understand, and observe
the safety instructions described in this manual. Keep this manual or a copy of it with the machine
at all times.
Always operate this machine in accordance with the instructions described in this manual. A well
maintained piece of equipment will provide many years of trouble free operation.
This manual is divided into the following sections:
SECTION 1
SAFETY
SECTION 3
SERVICE
SECTION 2
OPERATIONS
Complete any warranty requirements as specified by the engine manufacturer in their instructions
found inside the manual box located on the back of the riding trowel operator’s seat.
Your engine and clutch is not manufactured by Allen Engineering Corporation (AEC) and there-
fore is not covered under Allen Engineering Corporation, Inc warranty.
Your engine manufacturer should be contacted if you wish to purchase a parts manual or a repair
manual for your engine.
Refer to enclosed owners engine manual for complete O&M instructions. See your battery man-
ufacturer for battery warranty.
SECTION 4
PARTS

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Your Dealer has Allen Engineering Corporation trained mechanics and original Allen replacement
parts. Always contact the Allen Dealer who sold you this machine for Allen Certified repairs and
replacement parts.
Place Allen Dealer information below for future reference.
Dealer Information
Dealer Name: ______________________________________________________________
Phone #: (____) - ____ - ______________________________________________________
Address: _________________________________________________________________
City: ____________________________________ State:________ Zip:_____________
Salesman: _______________________________ Mobile Phone __________________
Additional Comments: _____________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________

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056335; 01/12
Section 4.0 contains illustrated parts lists for help in ordering replacement parts for your machine.
Follow the instructions below when ordering parts to insure prompt and accurate delivery:
1. All orders for service parts - include the serial number for the machine. Shipment
will be delayed if this information is not available.
2. Include correct description and part number from the “PARTS” section of this
manual.
3. Specify exact shipping instructions, including the preferred routing and complete
destination address.
4. DO NOT return parts to AEC without receiving written authorization from AEC. All
authorized returns must be shipped pre-paid.
5. When placing an order, please contact the AEC dealer nearest you.
All information, specifications, and illustrations in this manual
are subject to change without notice and are based
on the latest information at the time of publication.
Ordering Parts

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Model Number - Serial Number
Codes
Manufacturer’s Codes:
When ordering parts or requesting service information, you will always be asked to specify the
model and serial numbers of the machine. The legends below specifically defines each
significant character or group of characters of the Model Number and Serial Number codes.
Serial Number
The serial number found on the identification plate is a ten digit format. The model number
identifies your machine and will ensure that you receive the correct replacement parts.
750 06 08 010
Production Sequence
Model Number
HDX 750
MODEL
Year Mfd
Month Mfd
Series/Model
SERIES